I start rubbing my cock until it is really hard I then take some of the precum on my finger and insert it in to my ass it feels so good. I then use the other hand to slowly rub my balls and then I stroke my cock. I can go for ages like this alternating between my cock and balls with my finger up my ass. I do this until I am about to cum then I blow my load all over the place.
For easy cleaning use a condom on your cock and a rubber glove on your finger.