Arriving from a party, a couple meets the man's sister who is staying at their house for a while, the wife is tired, so she wants to take a shower, meanwhile, the 18-year-old little sister says she is bored, she wants remembering old times with her brother, flirting with him and mentioning that she wants to smell his cock like before, her brother succumbs to his seductive sister, but his wife is taking a bath right away and fate will make him discover her real fetishes.