I need a Male opinion or something

So, I have this person, we'll even go as far as to call him a friend that I've been working with (very part time) for bout 6 months. We've been snapchatting back and forth. Nothing vulgar, nothing questionable. A week ago, I had a pretty explicit dream about him. To the point I felt awkward looking him in the eye...but I could not stop thinking about him or the dream since. Mind you when we are working (hospital) he will point out all of these beautiful girls, that are thin, built in the way of boobs and ass, super petite and say how sexy they are. I, on the other hand am the complete opposite. I'm 5'11 300 lbs...pretty fat actually I just carry it well. I've been told I have a pretty face and personality so it makes up for my shortcoming. Anyway, I decided to just chuck it in the fuck it bucket and tell him about the dream. And to my surprise, he was like....well, do you want too? At that point, we had exchanged pictures of well, our junks.... and have unofficially made a plan to act out the dream...

My question is, are guys willing to just take a BJ or even more with any woman that approaches them with it or does there have to be some sort of attraction. I'm so confused with it. I'm in my mid 30s have been married 2 times but I cant figure this out for the life of me...someone help. Lol