How to start sexting

So, I’ve been in a long distance relationship for over 3 years now and we see each other fairly frequently. I get pretty horny sometimes and I wanna sext but idk how and I don’t know if he would be into it. I’m worried that he’ll be like “woah this isn’t you” but like, I’ve always been horny I’m just awkward and don’t know how to sexy talk. I also wanna send him sexy pics and stuff but I accidentally made him feel bad about me sending him pics a while ago and we haven’t done it since then. We’ve been together for such a long time now and I wanna make things exciting you know? Any advice helps!