ATOSM
Ass To Other Sister's Mouth
When one takes his penis from one girl's ass and inserts it into her sister's mouth. Or his sister's mouth. As long as the other sister is a relative of one of the participants, it is officially ATOSM.
When one takes his penis from one girl's ass and inserts it into her sister's mouth. Or his sister's mouth. As long as the other sister is a relative of one of the participants, it is officially ATOSM.
Those hot twin sisters are down with doing ATOSM with each other.