A brother asks his new sister to help him practice kissing after their parents remarried. Unable to refuse, the sister accepts, so the brother secretly puts an aphrodisiac in his mouth and kisses her! He tries to stop his out-of-control brother, but the drug gradually starts to work and his sensitivity soars! He sucks his tongue hard and she soon becomes aroused! When he inserts it into her sensitive pussy, she drools and makes a drooling face! She shakes her big breasts and goes wild with incestuous sex!