Well, I didn't expect so much interest in this..xD
Ok, so What I'm thinking is that males are treated as regular students (And teachers) in the Boarding school, but are still sought after as a food source. Monster girls can eat regular food, but semen is, of course, much better for them.
So, being a guy in this roleplay will be something of a double edged sword...on the one hand, you get a very good education (or teach a lot of different people if you're a teacher), with free room and board, and of course, lots of lovely monster girls want you.
On the other hand, you're sought after for your seed, possibly by several girls at once, which means you'll also be quite...exhausted every day. xD