Mika (Mori Hotaru) has always supported her adult son and his adult friend Hotta as they prepare for their exams. One day, she gives in to Hotta’s advances and agrees to have sex with him just once. But Hotta cannot stop thinking about the kind, stunning Mika—or the passionate kisses, deep blowjob, and feeling of her pussy wrapped around his bare cock that day. He breaks their one-time-only agreement, and Mika welcomes him back for another “private lesson.” They greedily lick each other’s genitals through strings of saliva before Mika straddles him and rides with her breasts bouncing wildly, finally urging him to cum inside her.