When I was a student, my brother brought her (Aika) to his parents' house and had sex in the next room. She's cute, charming, and has big breasts. If she contacts me that she is going to Tokyo on a business trip, she will let me stay. Aika-san, who met her again after a long time, was puzzled by her unprotected, unsuspecting no-bra appearance. I can't have sex with my older brother who comes home late because of her overtime work... It's such a waste to be so attractive! Aika is frustrated when she pushes her down impulsively.