Miyu, my girlfriend’s adult sister, runs away from home and comes to stay with us. After spotting my erect, sensitive nipples as I leave the bath, she begins whispering filthy temptations and teasing them whenever my girlfriend is distracted—during meals, in the bath, and even while I work remotely. She alternates soft scratches with hard pinches, then uses foam, lotion, and toys across ten nipple-training scenarios. Her close-up dirty talk and relentless teasing melt my resistance until I give in, switch partners, and creampie her.