A Very Intimate History

Riley has invited her best friend from college over to stay with her for the weekend.They intend of catch up and have a couple of days of fun planned.They have always been very intimate and nothing has changed.During some mutual fantasising together they admit they would love to share a man and the next morning, when Carter catches Riley and her boyfriend having sex Riley gives her the go ahead to join in the fun.Best friends always share everything, right?