Just practice. Or it was supposed to be. Mischievousness is an important skill here, I gather. You're tied up so I guess you're mine. I can delay your orgasm, I can time it. I can control it. These are skills I already have. Purposeful teasing and extending and control, these things are new. I have lots of experience with my hands from my life a a call girl, using that against you turns out to be easy.