What happened to my shoe? AVI (1920x1080) FHD

Description: I'm sitting at work in the office, playing with my stiletto heels. my shoes keep slipping off, and i try to put them back on, feeling under my chair with my foot. but one day, i couldn't find one shoe. i got up from my chair and looked around, but didn't see it, so i sat back to work wearing just one shoe. after a while, the shoe miraculously reappeared under the chair. i stuck my foot inside, and realized it was full of sperm; my pantyhose and foot were wet. how did this happen, and who did it?