Just with the nipples? I would like to be able to do that!
For now I rub my nipples when I am horny and it feels great, but not so much for cumming. I use a massage gel that has a small heat effect but it is too weak for the nipples. I will keep trying.
ooh, interesting cream i have to play with.
it takes time, don't force it. practice makes perfect but also makes permanent :]
i like that they feel good when u start jerking off ;]