I would offer a word of caution. If he is not interested in sex with men and worried that any encounter (even with former students) could cost him his job, then your approach could damage your relationship permanently. I am bi and try to keep my male encounters separate from my straight life. I know it is very complicated but I don’t want to sacrifice some relationship just because I wanted to get off.
Different story if he comes on to you
Straight Men are actually not attracted to men at all,but then neither are they attracted to their fleshlights, rubber dolls and pussies, masturbators ,melons basically; they just want to blow their load.
It's not about attraction, it's usually about discretion, also they know they call the shots and so even if their girlfriend or wife don't like being throat fucked or nor swallow their cum; they feel pretty certain you will!
Therefore if they are open to getting their dick sucked, they won't tell you outright but do it via innuendos and body language e.g.
they might stare at their crotch, grab their cock and re arrange it so you can see. And the most obvious is when they tell you their partners don't suck or swallow, their nuts hurt, or even I'd fuck a snake's mouth if someone held its mouth open.
But you have to understand,if you now them or you are friends, you have to keep sex and your friendship separate; they are only using you for a pitstop.
And in a cocksucker's point of view, you are using him fir the pleasure of having his cock in your mouth and hopefully getting him to an orgasm which means swallowing his load.
So for you, it's his smell ,legs,stomach chest arms, balls in your face pubic hair against your lips, and hesring him groan encouraging you or even hearing him calling you a good cocksucker.
For me that brings me to an orgasm. When he stands on his toes, arches his back or thrusts with all his might and gushes cum.
But for him it's just a warm wet hole and getting a nut!
There is no need to proposition a man, like I said, it's like they can smell you are a cocksucker and they will make the move.
I had one do that, and regardless of what he did in the end I just acted like I was deaf ,dumb and blind. And he was real confused in fact, he finally told me ,you know I don't know what you want.
I hated it because damn he had a huge bulge and his partner who just broke up with his girlfriend had a pair of BVD's on and his cock was so thick and big ,it was lying on his hip when I opened his bedroom door to ask him if he wanted any scrambled eggs.
Yeah he was facing the wall but turned around so I could see him well see his big bulge.
Now that man didn't have to say a thing because I already knew it
SUVK MY BIG COCK.
Otherwise he would have said no thanks, while still facing the wall.
Then the first man told me, you know I have a reak big yard, after taking off his shirt and talking about fucking a snake
We both went out and hecstarted pissing, I didn't dare look because if I did I knew I'd be on my knees not only to him but to his partner also.
I think most men are a little mire subtle but the important thing is not to look for ghosts because if tbey don't give you signals you can clearly interpret; it means, no!