[It's more than a little mean, it's downright unfair. And no marks--that's less of an unfair request, but still not one he's happy about obeying. If they're doing this, then they're doing this.]

D'you really get to make rules like that?

[He asks it somewhat archly, with some of his usual arrogance. No matter how secret they are, someone will find out, regardless. The school is only so big. It's something, him agreeing to fool around with her. Comments will be made. The least he can do is leave a mark, get what he wants--

But he pulls back a little, and when he kisses her neck again, it's a softer little kiss.]

But because you asked. Please--I think you could ask a bit more nicely, honestly, if you tried.