Back in the the old Army, before 'don't ask don't tell', it was a bit different.
I was new to Korea and a new sergeant. The opportunties to get laid were pretty much endless. However, I tried hard to stay faithful to my wife. I had been there a few weeks when another new sergeant arrived in our platoon. He was a prior service guy and had been in Vietnam.
His name was Danny Joe, and he was from down south and loud and a bit big. He and I started to hang out together, and as he was older than me he took charge. We would go out drinking in the ville and he would pick up some of the bar girls. He would always brag about his cock size, saying it was so big it would make the Korean girls' pussy hurt.
As we hung out he would tell me about his past adventures; he would fuck other men's wives while they watched, my first time hearing about cuckolding. I listened, and sort of thought that it was cool.
As we would get ready to go out to the ville he had a thing he would do; he would break out a vitamin E capsule and rub the liquid on his cock. He did this in front of me and I finally saw his cock and it was big (bigger than my six inches) probably about eight and a half inches and thick. He would just rub it in front of me. Then we would go out and drink and pick up bar girls.
One night after drinking and having some fun, when we both had an overnight pass, he wanted to fuck a Korean girl. She was pretty nice looking and had big tits for a Korean. We made the deal that we were both going to fuck her and spend the night. She washed us both both in warm water and looked at the differences in our cocks.
As we started, he wanted a blow job first and I started to suck her tits and moved my way down to her pussy and started to lick it. It was almost bald, just wisps of black hair. She must have liked it because she started grinding on my face.
Danny Joe was getting hard and now wanted to fuck. She slid into a 69 with me and I continued to lick her clit. She was sucking my cock and Danny got behind her and started to slide his big cock into her. She moaned on my cock, and I saw for the first time a big cock sliding into a pussy. It was beautiful.
I kept licking and could not help but lick her clit and Danny Joe's cock, watching it slide in and out. Fascinated to watch, I could see his veins and his big balls sliding above my face. I knew he could feel my tongue on his cock and her clit. She was going a bit crazy and came on my face.

I could tell I was about to shoot off in her mouth and I did just that, came harder than I ever had. She swallowed it all down. Then Danny Joe grunted and came in her pussy, I was still licking her clit, and as he pulled out he shot cum on my face and dragged his cock across my lips, keeping it there as he spurted more cum into my mouth. It didn't taste bad at all. Once he finished I continued to suck her pussy until she pushed me away. We all fell asleep in a little pile.
The next few days I was confused and sort of avoided Danny Joe, I wasn't sure what happened and wasn't really sure what the Army would do if it found out that I had sex with another man. About three days later Danny Joe and I had coffee and he brought up the subject. He asked if I was okay with what happened and I said I didn't know for sure. We hung out and talked.
Danny had told me that he liked the feeling of pussy and a mouth on his cock and wanted to see if I would be a willing particpant. I had to admit I enjoyed it. So that night as we got ready to go to the ville, Danny Joe did his ritual with the vitamin E, but this time he handed me a capsule and told me to break it and rub it on my hands. I did so, and he then told me to rub it on his cock.
I started to, and his cock was meaty to begin with and as I rubbed my hands along its length he naturally started to harden and I was jacking him off. He just let me do it, then I felt his hand on my arm as he pulled me closer. I had to kneel and my face was close to his cock; it looked so big and wet.
He told me to take it in my mouth, and I could not resist it. I licked it to taste it again, then took the head in my mouth and started to suck it. I know I didn't do a good job but he let me keep doing it, slowly at first. I licked down the shaft to his balls and back up again. He started to fuck my face, holding my head in place.
It felt like forever, but he was ready to cum and as he did he held my head and shot his cum into my waiting mouth. I swallowed as much as I could. I tasted wonderful to me.
Over the next year during our tour I would get lots of practice and would be able to deep throat him as good as any whore. He would also show how he could fuck and stretch my ass out. It was a great year.