Not Home Alone - FFM Threesome Erotica

Me and my friend Alice want to play a prank on my lodger Cooper by pretending to leave the house and sneaking up on him, but the prank back-fires when he starts masturbating!

Alice and I have already seen too much, but I don't want to leave Cooper unsatisfied.  I tell Alice to leave the two of us alone but soon discover she's been spying on us.  I feel so ashamed, but Alice is insistent that I continue.  I discover how dominant she can be as she takes charge, directing me on to Cooper's thickness and getting all of us satisfied.