In the dim light of their shared room, the pious sister and brother kneel, their eyes closed in prayer. But their minds wander, their bodies betraying their holy intentions. The brother's cock tents his robe, while his sister's nipples harden against her habit. Their father, a priest, enters, his eyes stern. "It's time," he commands. They rise, the sister's hands trembling as she reaches for her brother's robe, revealing his massive, erect cock. She gasps, her pussy clenching at the sight. Their father watches, his own lust stirring, as the sister tentatively touches her brother's cock, her fingers barely wrapping around its thickness. She leans in, her tongue darting out to taste the pre-cum beading at the tip. Her brother's hips jerk, his cock throbbing in her hand. Their father's voice cuts through the air, "Prove your worth. Take him in your mouth, daughter."