Suggestions for role-playing with my boyfriend?

So I(22F) have been dating a quadriplegic guy(20M) for 3 weeks now. He's been paralyzed from the chest down since he's 14. I'm his first girlfriend, and he already lost his virginity to me, but he isn't able to cum or get elections because of the paralysis. We've had tried different things and I've masturbated him, but he can't get it hard. The only thing that has worked for us is oral of him licking my books and vagina. I wanna roleplay with him, but I don't know what we could roleplay about that we both enjoy. Any suggestions about what we could roleplay?