Mia, a devout young woman, struggles with her religious beliefs and newfound desires. When her brother catches her masturbating in the bathroom, they're both shocked and intrigued. They decide to explore their forbidden feelings together, with Mia tentatively taking her brother's cock in her hand, feeling its heat. But as they begin to act on their taboo lust, a sudden noise from outside forces them to stop, leaving them both breathless and yearning for more.