I'm alone in a hotel room. Next door, a couple is making love.

There is laughter, giggling, and teasing. Good signs it's a healthy relationship.

I can hear the bed creak slightly, and I can picture the clothes strewn about the room. The condom wrapper on the bedside table.

She's not laughing now. She's moaning, pleasure robbing her of the power of speech.

Twenty minutes later, she lets loose, screaming as she orgasms.

I can't help it. I jerk off.

The next morning, as I step out, their door opens. I freeze.

My little sister's eyes widen as she recognises me.