You aren't gay, not even bisexual, but still the thought of having to suck another mans cock, makes you horny!
It's the humilation of being used, having to do something you don't really want to do, so he can get off! But of course you will have to be able to give him a proper blowjob and so we will practice today! Get something to suck and let's start!
Oh and of course you also need to be able to swallow the whole load that is coming for you... guess how you are going to practice that hahaha