Donnie is a young amateur chemist, who needs a guinea pig to test his latest concoction. He believes he has created a potion that will turn normal girls into raging sluts. So, he spikes the ice tea and offers a glass to his virgin sister (Tara Ashley). She takes a few sips, and his potion works! His sister becomes super horny. She can’t control herself and starts ramming her pussy with her fingers until she cums. She notices her brother peeking from the door. Tara commands him to get in her room, and begins to give him a deep, sloppy blowjob. While enjoying gagging on her brother’s dick, her pussy is craving his cock. She climbs on top and begins fucking him. Donnie puts her on all fours and plows his now-slut-of-a-sister, until he cums, and shoots a load of jizz into her mouth.
Donnie’s unsuspecting mom (Cherie DeVille) grabs the potion laced iced tea from refrigerator to quench her thirst. The spiked the ice tea turns her into an unstoppable nympho. Donnie soon comes across his mom as she frantically fucks a dildo… that is until she sees him. Now, all she can think of is sucking and fucking a real live dick. Completely out-of-control, Cherie gags on her son’s cock before she mounts and fucks his shaft. The taboo twosome lick, suck and fuck until Donnie empties his balls all over his mom’s face.
Later Donnie’s mom and sister come home, dying of thirst. He offers them some sweet tea as a final test of his chemical concoction hoping he turns them into nymphomaniacs. Donnie devilishly watches as the two girls guzzle down the sweet tea and become unrestrained ragging sluts wanting sex, sex and more sex. Soon the two sex maniacs are fighting over Donnie’s cock, seeing who could gag the hardest. Mother and daughter take turns frantically fucking Donnie and each other. The afternoon quickly devolves into complete debauchery filled with fucking, sucking, fingering and squirting until Donnie empties his balls over his sister’s and mother’s faces.