Shin'yū no imōto o kan'nō shōsetsu no moderu ni tsukatte iru ndakedo, dōyara itsumo kansō o kaite kurete iru no ga hon'nin mitaina ndaga (Associated Names)

I have a secret that I can’t tell anyone. It is that I use my best friend’s sister as a model for a heroine in a sensual novel. If he found out about this, he would surely despise me. But wait a minute. The one who always writes his/her thoughts on my novel is …….…