WANZ-373: Hey, Little Brother! Be Big Sister's Condom Practice Model — 麻倉憂

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My big sister, who debuted at university, got a boyfriend! Raised to believe “contraception is absolute,” she starts practicing putting on condoms using me, her little brother! Her awkward technique makes me get fully erect before I know it. Since I’m helping her practice, she says, “Do me a favor♪” — and it turns into a handjob, a blowjob, and then sex! The condom slips off midway, leading to unprotected incestuous sex! …But it feels so good, so it’s okay to continue and finish inside, right, sis?