The siblings, both virgins, are filled with shame and guilt after their parents catch them in the act. Their mother, furious, sends them to their rooms without supper. Alone, they both replay the scene in their minds, their bodies aching with unspent desire. The brother, unable to resist, masturbates again, this time imagining his sister's body. The sister, equally aroused, does the same, fantasizing about her brother's touch. Their secret sessions continue, filled with taboo lust and intense orgasms, their bodies betraying their best intentions.