Clad in their Sunday best, the siblings find themselves alone in the house, their parents away for the weekend. As they watch a wholesome movie, their legs brush, sending electric shocks up their spines. The innocent touch ignites a fire within them, and they soon find themselves exploring each other's bodies under the guise of comforting hugs. The more they touch, the more their inhibitions fade, until they're a writhing mass of naked flesh, their bodies slick with sweat and desire. Their moans fill the empty house as they act out their forbidden fantasies, their taboo lovemaking only heightening their pleasure.