I came in my ass
I had an operation a while back, to make my penis longer. The doctor cut the suspensory ligament at the top of the base of my penis, which is what holds it straight up when it's erect. It gives me another two inches of penis length, but my penis no longer stands up when erect, it hangs straight down.
It also allows me to bend my erect penis around so I can actually insert the tip of it into my ass hole. Now, I'm not gay or anything, but one night when my wife was away for a few days, I was really drunk and high on weed and had snorted a little meth and was feeling really freaky horny, and decided to see if I could actually fuck myself in the butt. I slapped some of the sex lube that my wife uses when she uses her big dildo and when I do her in the butt, on my cock. I stroked it till I was rock hard, then I bent it backwards until the head was up against my anus. I was able to get the tip inside of my butt, and it felt really weird and really awesome. I came almost instantly, and it felt totally fucked up shooting my load up my own ass. Not sure if I will tell my wife about it, but I am sure that I will do it again.