/feels/ - Advice & Venting

context: I'm in a committed relationship with a guy I've known for about two years. We get along okay, no real red flags or anything, he cares a lot about me admires me, and I like him for how genuine he is. Even with his other friend groups and stuff, he doesn't have wild personality swings or anything, like he's trying to be a people pleaser, and I don't get the sense that he's like that with me, either, he's consistent in how he talks and what he talks with me about

However, that's not what I got in a relationship with him for. A few times when I've known him, he's been really desirous, like, shit you only read about in an NTR doujinshi with how possessive he's been and the depth of the kinks(that he knows we share). He also writes, and some of the (can you call it fanfiction if it's about the two of you? lol)stories he shows me are incredible. He treats me like his best friend and inspiration, but this side of him blows that all away, I'm a total fucking simp for this side of him(pic)

My question is, is it bad of me to like, goad him into showing that side more often? I feel like I could sign away the rest of my fucking life to this guy when he drops his human skin and just acts like this cunning ravishing animal
I sometimes do stuff like referring to him in third person, as if there's another person that takes over when he's like that, but I feel like this could backfire and give him impostor syndrome or something. We've both taken up the habit of writing lists for things we want to do with each other(kink stuff, date stuff) but his is really short, and he knows this, and he says "I wonder if my standards for what to put down are too high"

Is there a better way to tell him to be more forward with his desires with me? I guess this isn't an uncommon thing to feel like men are too guarded, but I'd really appreciate any advice