How to convince my flatmate to let me suck his dick?

I'm a college student, been a faggot all my life, started to suck dick right after I turned 18. I've this one alpha straight man living on my flat, seperate rooms. From the dick print I see on his pants, he has a massive cock.

We share some classes, he knows I'm gay, we interact every now and then. I want him to turn me into his slave, and fuck me or atleast let me suck his dick.

How do I approach him, and get a taste of that alpha cock?