With a wicked gleam in her eye, the sister turns her brother around, pushing his ass towards her face. She dives in, her tongue lapping at his tight pucker, exploring every inch of his forbidden zone. She moans in pleasure, the scent of his musk filling her nostrils as she delves deeper, her tongue plunging in and out of his ass. The brother shudders in ecstasy, his cock rock-hard as his sister expertly rims him, their incestuous passion palpable.