Darkfur

I am cut, but still have a portion of my (once) inner foreskin. When masturbation was new to me, I soon went overboard: too many times, too long, too hard, whatever. The next day, my inner foreskin remnant was swollen out to each side, resembling a snake eating a mouse! I got real scared, and stopped masturbating for a few days until the swelling went away.

Based on my experience, I'd say your foreskin swelling is from that sexual marathon you had. But since this was sex and not masturbation, it may not be just from stress. Hope things are back to normal very soon.