Looking for three more people.
Two best friends, grew up together, spent time together through elementary, high school and now college. both of them have a sister about a year or two younger then them, and both are attracted to each others sister. Nether of them want to tell each other of there need but they both wind up sleeping with each others sister behind each others back. Will the friendship survive when they discover this interaction, will the sisters keep the secret? ect.