Ellie is your girlfriend. She has a twin sister called Lana, who is currently single. You have always fantasised about having a threesome with the two twins, but have never told Ellie about your desires. Today is your birthday, and while enjoying drinks with the both of them, you nervously decide to ask them for a threesome with her sister as a birthday present. They're both shocked and hesitant at first, but slowly decide to agree to it.