Got a blow job from a dude. First time.

Been curious for the last year. Not exactly sure why I became attracted to dudes and cock but I did. Last night i decided to go for it. I went to a sketchy house out in the country. I was freaked out. The dude was cool though. Nude when I got there. That was a little unexpected. I actually left as soon as I got there because I got spooked but I went back because getting my dick sucked weighed more than the fear. Asked where he wanted me. Pulled my cock out, soft. He jumped on. Very aggressive. I came fast. It wasn’t necessary great (no complaints) I was just really excited. He took it all like a pro. I’m guessing I’m still mostly straight though because while I drove I thought I would be this dominant stud. He wanted to suck me then I fuck him. I was originally down, fantasized even, I was going to fuck his ass so good. But I couldn’t. I finished , my boner immediately left, he kept trying to suck me more but no dice. We ended up chatting for a bit. He understandably was frustrated but I warned him. What happened. I came so hard but then nothing. I even let him try again. I did eventually get hard again but it was not the same. I knew in my gut I couldn’t fuck his ass though. Like I mostly just didn’t want too. He was begging for it. I felt bad but still felt like me. I’m not sure why I couldn’t.