Accidental Incest (F for M)

[DonnaSalmer]

Looking for an accidental Incest roleplay where we are brother and sister that get invited to a masquerade party at a large mansion. In one of the back rooms there is a swingers section of the party.  Neither one of us knows the other is at the party because we were invited by different friends. Both of us are talked into going into the swinging part of the house by our friends. The sex is very open except for the women keep their masks on. We go from partner to partner in uninhibited sex until at some point we realize our partner is our sibling. PM me if you want to work on this.