Finding My Way

Two years ago I walked into the flat I shared with my girlfriend, and caught her being fucked by a younger guy I knew. He was seventeen then, yet everyone knew about his supposedly large cock.
Angry and feeling hurt, I told the smaller guy not to stop.
He was fucking my girlfriend missionary at the time, so being a lot bigger (Stature) than him, I held him there while I removed my rock hard dick. Using only saliva, I slid my bare cock up his arse as a kind of punishment, fucking him hard from the first thrust.
What I didn't know then, is I wasn't the first to fuck him. Nor was his cock any larger than my own eight inch dick.
After a few minutes in which my girlfriend didn't stop encouraging me to fuck the young guy, he shouted out he was cumming and promptly spunked up my girlfriends pussy.
That got my loins going and I soon followed suit, cumming deep inside his beautiful arse.
And this is where things really changed for me. When I pulled out of his arse, he moved off my girlfriend, told me I felt incredible inside his arsehole and began licking and sucking on my cock.
As if she had the right to, my girlfriend started moaning about us enjoying ourselves without her, but we ignored her and got ourselves into a sixty nine.
We exchanged blow jobs (My first) for some time before I got up behind him as he knelt up.
My girlfriend had gone into our lounge by then, sulking and calling me a faggot.
But I didn't care as I fucked the young guy for a second time. It truly was an amazing fuck, one where I had my first gay kiss too.
Swapping positions a couple of times, we ended up as I'd found my girlfriend and him, fucking missionary. Only it was me fucking him.
And in a total surprise, we both came at the same time. Him spunking in between us as we kissed. And me cumming up his arsehole for a second time.
A couple of weeks later after I'd dumped my girlfriend, I moved Cory into the flat and we've been together ever since.
We do flip flop from time to time, as I've sort of grown to like cock up my arse, but I much prefer fucking Cory.
And just recently we've had another guy join us for sex. He's in his thirties and has fucked us both, but again I prefer fucking him and Cory much more.
If it wasn't for my ex girlfriend, who I still see around, I genuinely don't think I'd have experienced gay sex.
I suppose I must have always had gay leanings, but they didn't surface until I caught my ex taking Cory's cock up her pussy.
But boy am I now glad it happened that way.