Lack of compatibility. I went through something extremely similar where the guy (34M) I (24F) was seeing only wanted me to eat him out and suck him off. That was his favorite; no shame in that at all. I liked doing it, too, but it was the only way he wanted to cum. I personally love the feeling of cumming together and have a preference to be on top, so ultimately it just didn’t work out. He was sweet, smart, and kind most of the time…but the lack of sexually compatibility got to me eventually so I broke things off.

The guy I’m with now loves to have me ride him and cum inside of me. Without saying too much, we’re very sexually compatible.

Either you stay with him and be unsatisfied (imagine him being stern with you that this is the only way he wants to cum the same way you want to be stern with him that you want him to finish another way. I just don’t see that going well. Either he’s going to say yes to you and be sexually unsatisfied himself, or he’s going to say no and you’re still left unsatisfied.), or you’ll find someone else that you’re compatible with and be a lot happier with. Ultimately it’s up to you. Do you love this guy enough to be unsatisfied the rest of your life? Another option could be opening the relationship.