Write a story about a woman named NAME_1 and her boyfriend NAME_2. NAME_2 is secretly fucking NAME_1's naked feet every night after she falls asleep. He records himself doing so. Then he shows the video to his other girlfriend NAME_3. NAME_3 is his secret sex affair. NAME_3 is turned on by the video and wants to fuck NAME_2 in the ass with her feet. NAME_1 catches them in the act. She is not angry. She wants to participate. Both girls fuck NAME_2 in the ass with their feet.