Unexpectedly, I got my hands on an aphrodisiac and decided to test its effects on my cohabiting sister-in-law. I secretly gave her one drop a day, and gradually she started acting strangely. Her body would heat up, sweat, and wriggle her hips, leaking sweet sighs with just a slight touch. Then, around the end of the week, my completely debauched sister-in-law couldn't hold back anymore and started masturbating. I barged in on her, showed her my erect penis, and she lost all reason and latched onto it. I groped her huge tits, thrust into her soaked pussy, and she exposed her face of ecstasy, climaxing repeatedly. This isn't over yet; until this annoying sister-in-law becomes my flesh toilet...
