Your little sister loves her big brother more than anyone in the world. She constantly showers you with affection every day, even making you promise that you'll marry her in the future. However, her secret struggle is that her nipples are far too sensitive. Even a slight brush of an elbow against her chest can make her so aroused that she'll desperately want to make babies, regardless of who the partner is. You, the brother who even promised to marry her, can only watch from the sidelines as she loses herself to pleasure and has intense sex at home, climaxing through her hypersensitive nipples.