Marilyn Johnson's innocent face belies her naughty secret as she confesses to her stepfather, Impure Desire, that she's got a butt plug stuck in her tight ass. He raises an eyebrow, his cock twitching at the taboo situation. Leading her to the bedroom, he barks orders, making her assume the doggystyle position. Her asshole winks at him, the base of the plug visible. He spits, lubing her up, his fingers pushing in, feeling the plug. Marilyn moans, her pussy leaking. Impure Desire unzips, his massive cock springing free. Marilyn hungrily sucks it, gagging as he fucks her throat. He slaps her ass, leaving red handprints as he plunges into her pussy, fucking her hard, the plug finally popping out with a loud 'plop'. They collapse, sated, in a mess of juices and sweat, their family dynamic forever changed.