Not Straight Anymore?

I'm a straight guy or so I thought. I'd fantasized about being with a man but had never thought of doing it. Worked at the same company for three years, and worked with this one guy for the same time. He's funny and just a really nice guy to work with. He's good-looking and takes care of himself, girls at work love him and he's always joking with them. I didn't suspect anything, thought he was a real ladies' man even though he never spoke of GFs or hook up with any of the girls at work.

Three weeks ago we had a company night out, and we all got hammered. This guy from work kept trying to get me on my own, and the few times he did he did weird things like touch my ass and try to kiss me. I just put it down to the drink and just laughed it off. He told me we were all going back to his, so I thought great. We got a taxi just the two of us, I just assumed the rest would come in other groups.

Got to his and it was just us, we drank a lot more. He suddenly said he thought I was really cute and knew I liked him. Still drunk I tried to process this and tried to tell him I was straight. He just grabbed my ass and kissed me. A part of me was saying get away but my cock betrayed me and got very hard. I knew I wasn't ready for sex, I was too frightened, but when he took out his large cut cock I wrapped my lips around it like I'd been gay all along. He kept trying to have sex, but I was happy just sucking his cock until he exploded in my mouth. I swallowed a little but spat most out. I left quickly after.

I thought the next work day he might want to forget it, I wasn't sure if I wanted to forget about it even though I'd enjoyed it. But he was keen for me to carry on where we left off. I've sucked his cock 18 times so far but still not had sex, will maybe post a part two if I do. Thought i was straight, not anymore.