STARS-533 Practicing the cowgirl position non-stop with the super potent half sister from the room across

A half-beautiful woman who lives across from the apartment she moved to in Tokyo is always changing clothes with the curtains open and having sex with her boyfriend in full view from the outside. One day when it became her habit to peek into her foolishness, she was called out to her room. She said she wanted me to go out with her to practice sex.