Hidden in the closet, siblings grapple with their desires. The girl, haunted by religious guilt, watches her brother's cock grow hard. She and her sister take their stepbrothers' virginity, their tight vaginas enveloping the penises as they ride them, lubrication soaking the shafts. Post-coital remorse sets in amidst smeared juices, but the taboo lust lingers, a dark secret they share.