Her menstrual cycle dictates their rhythm, and tonight, it's his turn for a unique treat. She guides his hand between her thighs, letting him feel the damp warmth, the slickness of her desire mingling with her flow. He tentatively strokes her, his fingers tracing the soft folds, feeling the pulsating heat. She takes his other hand, guides it to his cock, and as he begins to stroke, she matches his rhythm, her hand working in tandem with his, their bodies moving in sync, their moans filling the room, a symphony of lust and taboo.