Give it in the ass

At your request, your future self gets down on all fours. You kneel down behind him, lube yourself with some spit and jam your cock up his rectum. He groans as he feels you pumping in and out. You move slowly, thrusting deeper each time until you are all the way up his butt. You fuck him faster, going in as deep as you can each time, your balls colliding with his. You feel yourself on the verge and shove yourself in to the max, shooting wad after wad into your future self's lower intestine.