pushing back on your fuck stick.
Lube up a massive dildo and ram it into your arse. Once you have it in sit on it as if you riding a guy cowboy style and really ride the thing move up and down so it feels like there is someone fucking your arse into next week, then just wank the way you like, hard or slow whichever way the orgasm is amazing!!juicy cock
If you take a plastice trash bag and stick it in between two matresses and then cover your cock in lube or a lotion of some sort, then fuck the plastic bag it feels realistically like a nice tight arse pushing back on your fuck stick. Charles