In this session, Tina uses Koki's face and tongue to clean her ass while humping and grinding on it. Koki is given clear instructions to lick the ass crack like her life depends on it. Tina's thick thighs and deep ass are overwhelming to Koki and she has no choice but to endure through the session and serve her mistress as told. She licks Tina's unwashed ass aggressively until she feels like gagging. This pleases her mistress and Tina bends over and spreads her butt cheeks wide enough for Koki to lick deep into it till she is dripping wet.