Confined to the closet, the siblings' religious upbringing fades as their bodies take over. The brother's cock tents his pants, and his sister, unable to resist, reaches out to stroke it through the fabric. He grows harder, longer, and she can't help but imagine how it would feel inside her. She leans in, breathing him in, her tongue darting out to lick the pre-cum beading at the tip. He groans, pushing her head down, wanting more. She takes him in, her mouth stretching around his girth, her hand cupping his heavy balls. They're lost in their illicit pleasure, the world outside forgotten, until a knock at the door brings them crashing back to reality.