Your step-sister helped herself to a little concoction you mixed up for your girlfriend. Side effects include: breast growth, bimbofication, extreme horniness. Anitdote? Cum. It’s either she needs to cum or she needs your cum. You can’t quite remember
You really expected to turn your girlfriend into a fun little fuck doll for the night. Too bad the dumbing effects didn’t quite hit your step-sister. She gives you little choice in the matter. You are going to drain your balls for her whether you like it or not. She needs these huge tits GONE.