MIMK-066 My little brother is seriously huge, want to come see him?

"My huge dick was found out by my promiscuous sisters!" The popular doujin has already been adapted into live-action! I was caught masturbating by my sister. Mine is quite large, and she spread it on SNS, leading to a dick appreciation party. My sister Chiaki with her perfect figure, Nagi with her erotic brown skin, and Yukiko who seems pure and attractive—all three of them stared at me, making mine swell up big time. And then, unexpectedly, I lost my virginity. Since that day, I've been having daily harem sex using my sisters instead of a fleshlight.