Brother becomes a slut after taking aphrodisiacs; sister, in lace, gets fucked to the extreme; Starry Sky Moe Ai; Sato Airi; SORA-135

Kenichi, the older brother, often bullies his otaku sister. But one day, his sister buys a sex-changing aphrodisiac, which immediately turns her brother into a slut. After that, she uses lesbian sex techniques until her brother no longer dares to bully her!