The siblings, bound by blood and secrets, find themselves alone once more. She sits on the bed, her small frame trembling with anticipation, her chich heaving. He approaches, his cock already hard, a tent in his pants. She reaches out, her tiny hand wrapping around his thickness, feeling its heat. He groans, pushing his hips forward, eager for more. She obliges, her mouth opening, her tongue flicking out to taste him. Their bodies move together, a symphony of forbidden pleasure, until they're both left panting and spent, their secret safe, for now.