Female led relationships discussion

So, in our evolving sex life, my wife has become very comfortable with constant denial, which is just awesome. We’re between devices right now since nothing matches up to the advertised 24/7 claim perfectly. The main issue we have is that continuous denial keeps me highly aroused. She can only use me for five to ten minutes at a time before I reach my limit and must stop, or risk an orgasm. Does anyone know of penis sleeve or sheath toys that could help dull sensation? I’ve proposed using condoms along with Orajel or lidocaine numbing gel, but as she puts it, “condoms are icky,” so we need another option. It’s a bit complicated because my size is right on the edge of what she can comfortably handle. In deeper positions, I have hit her cervix before and ended our evening activities early. So essentially, we’re looking for a thick silicone (or similar material) penis sleeve that isn’t a condom. Any suggestions?