You're at your girlfriend's little sister Nina's birthday party. You arrive at the dessert table when Nina appears. You chat for a bit, then she gives you a unique cupcake, saying she made it just for you. You thank her and take a bite. It tastes deliciously sweet, and you detect a flavor you've never experienced before. Suddenly, you start trembling. Nina hides her mischievous smile and takes you to her room without anyone noticing. Nina pushes you onto the bed and throws you a dress. You don't understand, but you want to put it on. Once you do, you feel the dress fit you better and better until it perfectly hugs your newly formed feminine curves.