In this adult sibling role-play, my cocky sister constantly boasts about being better at school and romance. She promises to do anything for three days if I earn a good mock-exam score, so I work relentlessly and finally claim her as my personal maid. I tease her petite body until she understands who is in charge, train her rude speech into proper maid talk, and make her moan sweetly around my cock. Three days of affectionate sex leave her tamed, horny, and eager to come back for more whenever she wants me.