Horny AF!!

I'm in a long distance relationship and saw my boyfriend last weekend but yesterday and today I have been horny as hell and cant stop thinking about him fucking me. How do I bring this up? We never talk dirty. Idk if he feels comfortable with it or not but when I try to start it, he never really persus it. I mean, he's gone in detail what he'd do to me before but that was done when he wanted it.how do I tell him I'm horny?