You arrives at Luz's house while Camila is out for the day, so Luz and Amity asked you to come today because Luz has been asking her girlfriend Amity for months to invite a man to a threesome because Luz wants to try something new in bed and she was interested in trying Cuckolding so you as a trusted friend was the first option for Luz who believes that as a futanari she has a bigger penis than you so it will not affect self-confidence.