A mature mother caught a guy jerking off with her underwear and fucked him for what he done.

 While visiting his friend, the guy went to their toilet, but along the way, as it sometimes happens, he got lost. His attention was diverted by the open doors to the room of his friend's mother, and in this room the guy got lost. It’s good that a few minutes later the friend’s mother came up, because a few more minutes and only threads and traces of sperm would have remained from her underwear.