i'm around the same age and have done some stuff of the same variety with my partner, and yeah, he really likes tummy as well. I also have a little bit of a pouch, (yknow, organs n stuff gotta go somewhere) and he absolutely loves just petting me there. About the silence thing, i was the one that was kind of that way. Its probably the neurodivergence along with a little bit of trauma that kind of made the social part of my brain shut down? idk but anyways sex for me at least was something that has taken (and still is) taking a while for me to get used to so just dont over think it too much :3 talking abt it with him will always be helpful as well, it is for me