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◆My older brother Atsushi (30) is teased and made fun of by his two younger sisters every day. I was planning to see my sisters again someday. Finally, he obtains an aphrodisiac through mail order, turns his sister into a lewd woman, and takes revenge! ◆ "Give me your dick too" My geeky, unassuming big-breasted younger sister and my healthy, fit younger sister will turn into a super bitch if you give her an aphrodisiac! She keeps having sex all the time for 24 hours! The two targets are Mio (25), an otaku and plain big-breasted sister, and Mari (20), an active and stylish younger sister. He mixes an aphrodisiac he bought online into his sisters' drinks. It's a great aphrodisiac for young girls, and their dicks tingle as soon as they drink it! And then...as I had calculated, I started asking for my brother's cock!