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

In Tokyo, the half-Japanese beauty living in the apartment across from mine always changes clothes with her curtains open or has sex with her boyfriend where it's visible from outside. I got into the habit of peeping at her lewd acts, and one day she called out to me and invited me into her room. She said she wanted me to practice sex with her. She pushed me down as I was taken aback and suddenly transformed into a slut...