I was 14 and used to playing with my cock and enjoyed getting it super hard and stroking it but never for very long. But one day I decided to stand on the toilet seat so that I could open the medicine cabinet window door and see my dick. I was quite impressed at how proudly it stood out from body and how I could rock it up to hit my belly just by squeezing my groin muscles. But then I started forcing it down between my legs and rubbing it between my hairy thighs. I don't know why I didn't stop but I like the feeling so much just could not stop. Then suddenly I felt this excrutiating grabbing feeling in my groin and with no warning shot this gigantic glob of slop on the wall, the mirror and all points in between. I literally almost fainted since my whole body was just seized with uncontrollable convulsions. Since there were droplets of blood in the cum I thought I had torn something out of my insides and would probably get very sick very soon. I waited a few days to see if I got sick and when I didn't I proceeded to masturbate to ejaculation several times a day and still enjoy it. I suppose the blood was from all the abrasion I was creating on the dick tip with all that fierce rubbing cause never saw blood there again.