Big Brother's Biggest Fan, the Incestuous Rin, Was Desperate to Have Sex with Her Brother but Her Brother, a Man of Reason, Didn't See His Sister as a Sexual Object at All. 'That's It, I'll Use a Love Potion!' Realizing This, Rin Decided to Drown Her Brother in a Love Potion! Her Brother, Losing His Reason to the Potion and Unable to Stop His Full Erection, Engaged in Relentless Sex with His Adoring Sister!