A 18-year-old fit man has found a cave and a lake inside, the 18-year-old man decides to strip naked and take a dip in the lake after a long hike. The water is clean and clear, you can almost see to the bottom, the 18-year-old man swims to a corner to rest and enjoy himself, he gets an erection and decides to masturbate, at the same time the surface of the lake starts to shake until a monster rises from the lake who also has an erection. The monster grabs the man with its long tentacles and lifts him up, at the same time one of the tentacles is already pushing into the 18-year-old man's anus so deep that the man's stomach starts to bulge a little and at the same time sperm is already flying out of the 18-year-old man.