As the door creaked open, his eyes widened in shock at the sight before him: his daughter's hot friend, naked and kneeling on the floor. Her big tits jiggled as she panted, a collar around her neck. She looked up at him with wide, submissive eyes. His cock twitched in response. "You... you set this up?" he managed to ask. "Yes, daddy," she purred, reaching for his belt. "I want to make you happy. I'm your submissive college slut now." And with that declaration, she lowered her mouth onto his hardening cock, taking him deep into her throat. Her tongue flicked at the head, sending waves of pleasure through his body. She knew just how to serve him well.