By chance, I stumbled upon my sisters' AV viewing party. As an older brother, I think I should be careful, but considering my recent relationship with my younger sister, I decided to leave it alone... Howeve...

"How did... you... find out?" After Questioning the committee chairman, I found out that she has an extremely sensitive pussy. Even when she's about to faint in ecstasy from having an orgasm, she still won't...