[Chinese]SCPX-291 My parents remarried through partner swapping?! Suddenly, I have a same-age sister living under the same roof...

A couple I met on a trip. Both sets of parents suddenly said they wanted to swap partners and remarry. They even suggested living together with the other party's daughter. I gradually became attracted to this new sister of mine who appeared out of nowhere. We crossed the line because we were too aware of each other... We hugged naked without our parents knowing, engaged in passionate deep kissing, had raw sex, and ejaculated inside during unprotected SEX.