They had agreed to retire to Maya's bedroom after a day by the pool, but they hadn't yet decided if they were going to fuck for the first time. As they walked there, both naked, they chatted, knowing that there was a big decision to be made.

However, Kevin, with his cock wafting in the breeze, had already made up his mind, and he asked for the umpteenth time, “Did I guess the page number?”

This was a reference to the fifth homework question that his sister had earlier set. She hinted that they would go all the way if he got it right. 

“You may have done,” Maya teased, still thinking, still somewhat unsure. Her brother seemed to be a quick learner when it came to sex, and she wondered how much help he really needed. “For us to have sex together is a big step. It's not like I can be unfucked when we have done it!”

Maya opened her bedroom door and looked at her bed before turning to her brother. “I need to point out that if we do this, no one must know, and I mean absolutely no one.”

Her brother grinned.

“Kevin, I am being serious. It has to remain a secret, one that we take to the grave.”

“I know, sis, but I want to,” Kevin stated, knowing he was now thinking more with his engorged cock.

Maya looked down at her brother’s erect phallus; the warmth between her legs telling her just how much she wanted it. The thought of having illicit, taboo sex with such a large penis sent naughty shivers up her spine, ones that had started in her pussy.

Then, without thinking, Maya kissed her brother, their first kiss of the day, and it was not long after that they found themselves in a sixty-nine position, feasting on each other’s sex. 

“That feels so good, sis,” Kevin gurgled as Maya ran her tongue the length of his shaft and gently licked around its purple gland. He felt lustful sensations, little tingles of pleasure, each one telling him that his sister was excellent at giving head.

Maya had become captivated by her brother's penis. It had charmed her. She had blown quite a few college guys, but because of its size and that it had a foreskin, this cock was a completely different experience for her.

She wrapped her mouth around it once again and bobbed her head as she tried to control the magnificent weapon but only managed to get a third of it in her mouth. She knew if she wanted to take more, she would need to work on taking it down her throat.

As Maya’s head bobbed away, Kevin was proving to her that he did in fact know where her clitoris was as he licked her little bud. With newfound confidence, Kevin ran his tongue along his sister’s bare slit and then dipped it into her sweetness, his action producing the now-expected moan from his sister.

Yes, he was learning.

Maya whispered, “Thirty-two, you were right... Now, fuck me!”

She had made up her mind, and it didn’t matter that her thumb had been on a different page number. At that moment, Maya needed her brother’s cock.

She rolled over onto her back and spread her legs, offering herself to her brother.

“Go easy until my body has time to adjust,” she excitedly whispered.

Kevin couldn't help but smile as he looked at Maya. His sister's beauty, her pussy open, wet, and expecting, energised him. He felt an urgency bubble up; they both wanted this. He knew he could live with the consequences.

He moved forward, and his cock-tip brushed his sister’s engorged cunt. She flinched at its touch and then relaxed as he eased his bulbous cock head into his soaked sister's opening, her cry confirming to her brother that she was in ecstasy, or possibly pain! 

“Go slowly, Kevin,” she whispered as her pussy adjusted to the size.

With care, he gently eased his cock into her. As he did so, he realised Maya was soaked and tight. However, as he carefully pressed into his sibling, another taboo thought entered his head. It was one of comparing Mrs Tanya Betts to his sister. 

With Mrs Betts, she was cheating on her husband—her older pussy, hairy, different, and slightly looser. She had fucked him long and hard, impressed by his girth and length. Yet, Kevin had been worried and kept glancing at the bedroom door, expecting her husband to burst through it even though he had been told that he was away.

Maya seemed just as eager as Mrs Betts, yet she felt different. His sister’s cunt was completely bald and snug, and despite being more taboo than Tanya, he felt more at ease, even relaxed. 

“Your pussy feels so good,” Kevin whispered, with half of his cock’s length now inside her.

Then with a swift urgency, their bodies moved in time, almost horizontal dancing, as they pleasured one another. With each plunge, Kevin pushed a little deeper and a little firmer as Maya’s pussy adjusted to this new large cock. Her face now flushed with desire, her body meeting her brother’s thrusts. Her eyes locked on his, the day of pent-up sexual tension now being released as the siblings fucked.

Kevin was on top of his sister; he felt in control; confidence was now flowing through him. It was so different for Mrs Betts.

“Fuck me,” Maya gasped, her pussy now taking two-thirds of the length of her brother’s cock.

The siblings had not been fucking long, but they were already close, with Kevin already trying to edge himself, thinking about anything but sex.

Any initial pain Maya had experienced had now turned to hot molten pleasure. The wetness of her cunt did nothing to douse the flames that now roared within her. She wanted her brother; she needed this cock.

Maya screamed, “Cum in me!”

Her body convulsed, his cock now deeply penetrating her molten core as three-quarters of its length slid in and out of her.

Kevin's face contorted in discomfort and ecstasy as he felt his aching testicles swell. He was so close, his sister's legs now pulling him deeper as his cock probed Maya’s hidden depths.

“Do you like this, sis?” Kevin breathed, his only thought to make his sister cum.

“Fuck… Yes,” Maya screamed. “Cum in me; I want to feel you!” her pussy pulsating around her brother's cock.

The siblings were both at the point of no return, their bodies intertwined, three-quarters of the length of Kevin’s member buried deep inside his sister as Maya’s orgasm overtook her body. A primaeval scream escaped from her mouth, her eyes alive, open, and borrowing into her brothers.

With his sister’s screaming ringing in his ears and his swollen balls feeling like they were the size of lemons, Kevin grunted to signal his release. He shuddered as they both gasped for breath. Then, with a feral grunt, he joined his sister and came—his potent seed flooding Maya’s stretched pussy.

They lay there, panting, each with their thoughts. Then, after a few seconds, Kevin absentmindedly muttered, "Fuck, that was good."

With their sweaty breaths now beginning to return to normal, and Maya coming down from her orgasmic high, she expressed just a single word, "Wow.”

As Maya felt her brother's large cock slowly shrinking inside her pussy, she kept her legs locked around him, trying to keep him close.

“Sis,” Kevin whispered, suddenly unsure as he thought of something important, and it wasn’t Mia.

"Maya, are you on the pill?" he asked, feeling his semen begin to drip out of her pussy.

“Let me think,” his sister teased, smiling. “Maybe that’s something you should ask a girl before you put your bare cock inside her.”

Kevin’s mouth dropped open as he knew his sister was right. He suddenly hoped that she was—yet his semi-hard dick was still inside her, enjoying the feeling.

He waited for the answer, but it didn’t come.

Instead, Maya surprisingly asked, “Do you like the thought that you might get your sister pregnant? Some couples like that risk.”

“Err…” Kevin was unsure. It was something that had never occurred to him. Yet he felt his cock twitch.

“You do,” Maya wickedly remarked as she felt her brother’s dick begin to harden. She planned to have a little fun at her brother’s expense before confirming that she was indeed on contraception.

“Are you man enough to fuck me again?” She softly taunted, hoping, and then gently giggled, “It will be good for your confidence.” Maya could feel her brother's cock hardening by the second. "This time, I want you to fuck me harder, as your spunk will act as lube. I want to feel the entire length of your dick... So pound me!”

Her brother grunted, the idea of the naughty challenge propelling his cock to full hardness.

“I want you to pump me full of your potent seed,” Maya teased, not sure that her brother needed much education when it came to sex, but knowing she needed another fuck.

Renewed energy flowed through Kevin, and thoughts of Mia were pushed to the back of his mind.

“Challenge accepted,” Kevin grinned, then he hesitated as he looked deep into his sister's eyes.

“Are you on the pill?” He carefully asked again, not knowing what to do if the answer was no.

“Yes…” Maya replied, pleased that her brother was learning, though at that moment it was more about the need to feel his large cock inside her once again.

Now hard, it didn't take long for their buttocks to move in another taboo fuck. This time, Kevin didn't hold back, eager for his sister to experience his full ten inches.

The second time, the siblings fucked much longer and harder. With rekindled confidence, Kevin did as requested and pounded Maya’s cunt, filling it once again with his cum, his sister taking most of his cock length, but not quite all.

On hearing that, Maya felt slightly disappointed and told her brother that from now on it wasn’t all about him gaining confidence. That there was a second special mission, another one that they had to both work on.

Her brother laughed when she told him that by the end of the week, she wanted to be able to take the full length of his cock.

It was Maya’s final remark before she turned over and went to sleep; her brother snuggled up with her.

They didn't realise it at the time, but they had already established their sleeping schedule for the week.

*****

“I don’t want to go shopping, especially with Karly and Victoria,” Kevin whined.

It was Tuesday morning, and after a night of sex, Maya was driving her car to the large city mall. She was smiling to herself, partly because of the day she had planned for her brother and partly because she was still carrying a warm glow between her legs.

Her pussy may have felt slightly tender, but it was a warm sting. Maya hadn’t managed to take her brother’s full length, but it had been close, and Kevin had enthusiastically promised to keep trying.

Maya didn’t regret having sex with her brother. She had enjoyed it and wanted more, but she also knew his large cock size could become addictive, having touched places in her body that she didn’t know existed.

However, it was now very obvious to her that when it came to having sex, her brother didn’t need any practical training. His issues were more about being shy and the lack of communication skills with the fairer sex, and this is what today’s shopping trip would be all about.

“Kevin, today you are my boyfriend,” she stated as she stopped her car in the parking lot. It was a statement that had her brother look at her, and he stopped grumbling about shopping.

“What! But Karly and Victoria know we are brother and sister.”

“I know, but we are only going to be with them for lunch and one shop after. They are off to the movies to see the rerun of Barbie. If you don’t want to shop, we could join them if you like."

“Nooooo!!!”

“So you do like shopping, Kevin.” Maya retorted, getting the expected reaction from her brother.

“That’s good to know for the future,” Maya then teased with a giggle as she got out of her car, her short white skirt riding high up her smooth, shapely thigh.

Her brother noticed and couldn’t help but stare, a pang of pleasure going to his cock.

“Maya, do you really want us to be boyfriend and girlfriend?” Kevin quietly asked. He was surprised and fell into step with his sister as they walked to the mall.

“Why not? It is unlikely that anyone will recognise us here. But, do remember, you are only my boyfriend when we are not with my two friends.”

Kevin smiled, thinking for a moment before mumbling, "I never thought my first girlfriend would be my sister."

Kevin’s quiet remark caused Maya to giggle and then nudge him. She never thought of that!

“What was that for?”

“That’s what girlfriends do.”

Then, with a giggle, she nudged him again and said, “And so do sisters.”

He was indeed learning.

“Remember, we are here to improve your communication skills with girls. That's why I invited Karly and Victoria; the more experience you get at real talking, the better chance you will have with Mia.”

“I know,” he replied and then paused. It was clear that he had thought of something.

“Do I get another special reward, like yesterday?”

Maya glanced at her brother. “We are a couple, Kevin.”

That remark had him thinking as he tried to understand his sisters' ‘girl speak.’ Then his frown turned into a smile as he got it.

“Yeah, I guess that reward went both ways,” he remarked. That earned him another nudge, even if Maya laughed and offered her brother her arm, which he took.

She then softly said, “We still have that special project, so I guess there will be a few more special rewards this week.”

Kevin felt his large cock harden and hoped that it didn’t show in his pants. He was also starting to realise that perhaps shopping could be fun if you had a girl like Maya on your arm.

They arrived at the barbershop; it was the first stop of the day.

“Right, remember this is for Mia, so as agreed, get your hair cut just like the gorgeous male model in this photo.”

Maya passed to her brother a black-and-white picture of a guy with a modern hairstyle. Kevin frowned, not liking what he saw. “So this is for Mia, then… But I still don't understand why you trimmed my pubic hair this morning and shaved my chest hair."

Maya laughed at the rather random statement, even though she had already explained why.

“Kevin, you only had six chest hairs, and they looked pathetic. As for your pubes, think of it this way; now they are short, neat, and tidy, and your cock will look even bigger.”

“But I don’t want my cock to look any larger; it already is an embarrassment.”

Maya giggled.

Sporting a renewed frown, Kevin turned and, carrying the photo, walked into the barbershop.

With lunch beckoning and his hair now looking like it should be on the head of a male model, Kevin and his sister met Karly and Victoria at a well-known fast-food venue.

As his sister chatted away to her friends, Kevin couldn’t help but become nervous and on edge. It hadn’t helped that both girls had used cringeworthy lines when greeting him.

Karly had said, “This is your brother; hasn’t he grown a lot since I last saw him?” despite seeing him at their home only two weeks ago!

Then came Victoria's comment, "I like your hair; it suits you." When she said it, Kevin got the distinct impression that she had been primed to say those very words. 

Maya’s brother did not have the same social skills as her; he was wired slightly differently. Yes, he could be creative and imaginative, but his mind was driven by logical thinking. This was part of the reason he excelled at chess.

As Kevin sat there, he gradually became unsure, not believing that his sister would bring up his lack of confidence over the phone to her friends. However, to Kevin, the evidence was there, and he slowly withdrew from the table conversation and found solace in his French fries. 

It was Maya who noticed and successfully got her brother back into the conversation, first with a discreet squeeze of his thigh and then the mention that the four of them were only going to visit one shop. So Kevin would not need to carry many shopping bags for them. Though, of course, another frown did briefly pass over his face. It was one that soon returned, this time deeper, as he found himself being dragged by the three ladies into a menswear shop.

When her brother naturally complained, Maya reminded him that he needed a new suit for Friday’s college ball. They both knew she was talking about Mia.

A rather camp, shop assistant named Richard greeted them and asked if he could help. The three girls said yes. "And don’t worry about the price, as Mum and Dad are going to pay for it,” Maya remarked as her still frowning brother was taken behind the curtain and into the fitting rooms.

Kevin felt like he had been professionally measured, probed, and adjusted before he found himself standing there in a fitted black tuxedo suit complete with a dress shirt and black bow tie. Somewhere during the process, he had to answer that embarrassing question: “Which way does sir dress?”

There was no doubt that after that, Richard knew that he was packing.

It was with a large intake of breath that Kevin stepped through the curtain, dressed smartly in the new tuxedo suit. He may have looked like James Bond, but he felt more like Mr Bean as he stood there in front of the three young ladies.

Richard, the shop assistant, gave him one last brush down before Kevin paraded around the shop showing off his new tuxedo, yet feeling embarrassed. 

“What do you think, girls?” Kevin muttered, expecting the worst.

“Could you walk up and down a bit?” Victoria asked. She was clearly impressed with Maya’s brother.

He did as requested.

“Turn...