I personally prefer to masterbate into my own feces...and if I am feeling extra wild, I'll jerk off all over my girlfriend and then take a dump on her chest...
Get a pair of white spandex trainer liners, small size, they s-t-r-e-t-c-h. Put one on your cock so that the heel can accommodate your balls. Tuck the open end round the cockring that you wear round your cock and balls. Start pumping. Your precum should provide enough lube inside to make it feel good. Squirt when you're ready, then feel that warm goo trickle down over your cock and balls. Repeat when necessary.
Yup especially if you have a sock fetish. It's more normal than you think. Guys just don't mention it, because they think it's wierd. It's not. I love seeing a guy in white socks and imagine what I could do with them.