When a man returns to his parents' house for the first time in a long time, his niece welcomes him, looking much prettier than ever, with her breasts now larger than ever. She still has the same childish, spoiled personality, and presses her breasts against him defenselessly, and even gets naked in front of him, saying, "Let's take a bath together." The man is confused, but unable to hide his excitement, so he teaches his niece how to do a titty fuck and a blowjob, and enjoys a mixed bath with her. And then the man's actions escalate even further...