I want to fuck my professor

I 21 f have been obsessed with one of my professors I think he is between 33 to 40 yo and I really like him, this is the first time I’m interested in an older man so I don’t now what they like or how I should approach him, already saw and on my college student-teacher relationships are allowed as long as both are of legal age, I know he is not married and he is not seeing anyone, I really don’t want a relationship, I just want to have sex with him Can someone tell me what hat older guys prefer on younger girls?