My domme and I are extremely infatuated with chastity and are at the point where I can go months at a time locked and only allowed out under her supervision. Everything's perfect! Except my stamina during sex drops precipitously off a cliff lol. It's a challenge to last more than maybe 10 minutes and it usually involves me going very slow and having to stop and switch to a dildo before I bust without permission.

Does anyone have any tips for ways to increase stamina? Without chastity I can go for 45/60 minutes no problem and only cum with her permission. We have tried a few things like her giving me a ruined orgasm or a full one and then a short break before going for full PIV but it's inconsistent. Maybe a cock ring to keep me hard after a ruin? I've also heard things about numbing sprays/creams but I'm not sure if A: it's safe and B: if it will end up on her through a condom