Amber Summer and her stepsister Summer Renee seek therapy for their unusual fixation, but Dr. Peter Fitzwell finds himself in over his head. The young, big-cocked therapist is no match for the sisters' insatiable appetites. They hungrily swap blowjobs, their tight teens 18 pussies dripping with anticipation. The old-and-young threesome escalates, with Amber and Summer taking turns riding Dr. Fitzwell's massive cock, their family bond deepening in depravity.