A submissive man, bound and collared, is taught the art of cum-eating by his mistress. She coats his face and tongue with her pussy juices, then brings in her lover to fuck her hard while he watches. The cuckold slave is made to lick and swallow every last drop of his boyfriend's cum from her pussy, the bitterness a constant reminder of his place. He's rewarded with a taste of her pussy, but only after she's satisfied he's learned his lesson.