Cosima was getting her makeup done by her step-mom,  Sasha. This is usually their bonding time where she gets advice and gossips about things happening in school. Sasha asked her step-daughter if her current BF had ever given her an orgasm,  and Cosima was unsure. Sasha quipped that if Cosima wasn't sure,  then he definitely hadn't given her one! Then she seduced her by insisting that she should be the one to teach her how to reach orgasm on her own. Cosima was shocked,  but her step-mom wouldn't take no for an answer.