My nipples are connected to my dick and asshole directly! They are very well wired. Everything I do for sex has to do with all three. Just brushing my tits gets my dick to start getting hard. I always combine, almost always, tit play with estim or enemas.
Sometimes I put large binder clips on my tits, starting with most of my nipple in the clip, and then reclamping them a bit closer and closer toward the tip of my tits as I progress in my hotness. If really hot, I pull on the large binder clips to the end of my tits. After I cum, I have to get them off quickly, because when on the very end of my tits they hurt a lot.
One of my favorites is estiming with a prostate stimulator and a ring on the end of my dick, and playing with my tits until I achieve HFO with the P.E.S. box. The amount of cum I shoot is amazing.
Another favorite is ghost fucking and playing with my tits. That, is really hot.
I do all of this in front of a large floor to ceiling mirror in the bathroom. I do have some very hot jerk off sessions.