Ditto those about the story being hot. Not sure if you meant it to so sound erotic but it certainly got me fired up

I would say that probably are bi-curious as well. I would say most straight men would probably not have a desire to perform oral sex on another man. But equally so, I wouldn't worry so much as labelling yourself as gay or straight; perhaps you're just a very sexual person who is attracted to men but likes the male dominance that your friend brings.
Either way, I'd definitely look into writing more tales