A girl who wants to prepare for parenting with her boyfriend. As practice before having a baby, she uses a breast pump to experience being a pretend mom, training her body to produce plenty of milk. Her reactions are enthusiastic: "This is amazing///", "So this is what it feels like w///", "It's sucking so hard w so erotic w///", "Now I wanna have a baby ww///"—showing cute, slightly embarrassed responses throughout. Unexpectedly, a day comes when she starts feeling jealous of the breast pump. Using the device makes her nipples increasingly sensitive, enhancing the realism of the experience. While the breast pump is important, feeling a real baby suckle is irreplaceable. They indulge in breastfeeding play—sucking, kneading her big tits—gradually building a highly erotic atmosphere. Before long, they end up having sex. "Nngh... today's crazy... cum inside me///", she pleads, and they make love repeatedly throughout the day. Her pussy gets "milked" even before her breasts, making it easy to understand why he calls it the ultimate breast pump. Here lies a special experience where parenting preparation blends perfectly with intense, creampie-filled intimacy.