After the Koi Carp Transforms into a Vicious Female Supporting Character

When I woke up, I was transported into a romance novel with many male protagonists. The school domineering male partner and the delicate female protagonist were making love to each other in the female dressing room of the shopping mall. In the cubicle, I made a constipated sound of "hmm", and the world became quiet. The school bully wants to hunt me down. This is hard to judge. Every line is like a mountain. I wish him success! After all, I have a koi constitution.