Jaded by a recent breakup, Kate's birthday is anything but cheerful. Her stepdad, Donnie, noticing her melancholy, decides to cheer her up. As she blows out her candles, he presents an unexpected gift - himself. Kate, taken aback but intrigued, accepts his tender, comforting touch, soon escalating into a passionate, taboo fuck fest. Holly, watching from the shadows, feels a pang of jealousy, her own birthday forgotten as she dreams of her stepdad's loving embrace.