This one is a little out there. This is a difficult techniques but fun. I like fucking my wife's feet especially in nylons. Unfortunately she does not share my same enthusiasm I get to blow on her toes about 3 4 times a year. She always lets my start fucking her feet usually bare but this always leads to sex which is fine too. I digress.
Get a pair of stockings or nylons\pantyhose. stockings work best if you try this you will find out simply due to the mechanics required. Slip them on be careful if it is your first time they tear easily.
lye on your back use a pillow for comfort. then begin. I find my left foot goes on the back side of my cock and the right at the front depending on flexibility a size this may be difficult to achieve. there is fair deal of trial and error required. Rub vigorasly with your feet till you explode all over them. You could try this bare feet with lube too in the tub less clean up.
some clean required more fun with a partner using there feet but something a little different.
enjoy