If wishes are equivalent, it's OK under the restriction of changing common sense in an AV! If the scales of requests balance, the other party absolutely cannot resist! You can have your way with your sister or her friends through sexual exchange conditions! Intensive cunnilingus earns you intense fellatio in return! Does an unreasonable equivalence exchange stand? Sister's friend becomes a slut! Finishing with massive internal ejaculations in the deepest part of the vagina!
