While their parents are away, the brother takes advantage of his sister-in-law's weakness to secretly administer a love potion. Furthermore, treating her as "study desk," "chair," "table," etc., human furniture... the drug starts to take effect and her sensitivity skyrockets! He thrusts a vibrator deep into her aching private parts and secures her firmly! She's not allowed to move and climaxes, soaking everything! Completely losing her reason, the sister succumbs to incestuous sex, treated as an object by her brother!!
