Sex and spicing things up

So I’m 18 please don’t say I am too young for sex I feel like I am pretty mature on most stuff and so is he, I’m on here just to see if there is any way we can make our sex life exciting? It’s great we really feel connections but I want to personally try spicing things up. I usually ask him hid things are okay first but honestly I’ve never had sexual experiences where we do anything other than just being a little playful and teasing but he doesn’t tell me what he would be into and I know sex isn’t “perfect” but I want it fun for him. I got a few things he likes and he says is fun just trying to get him out of his comfort zone. He’s very respectful and gentle so the s&m BDSM and all that isn’t really something he’d enjoy. I need advice or if there is a way to make that stuff not so aggressive if anyone understands something interesting also you guys are so amazing I post here a lot and it helps me realize I’m not alone and you ladies have my back and are understanding ❤️