The girls were looking for fun, riding in the car. Sometimes they got themselves excited. Apparently they wanted a new sensation, so they offered a threesome to a strange young, handsome guy. After some persuasion and conversation, he agreed and went straight to work. The girls hooked up with him, gave him blowjobs, rolling on top, while two were fucking, the third fondled the couple.
The couple had sex with mutual attraction, so there's really something to see here. It's not a tender relationship, but a passionate one. The guy fucked his pretty brunette sister in different positions, twirling her legs and ass in the process. He did not forget about the male pleasure - there was a blowjob, and after sex he cum on his sister's face, on her heated and young skin.
What's with the effects?