Yui noticed that her son Akira was unconsciously scratching his crotch, so she decided to lend him some sensitive cream. After a while, Yui said, "Oh no, I'm starting to get itchy too..." Yui went to Akira's room to get the cream back, but he wasn't there. After searching all over the room, she finally found the cream she had lent him and Yui it into his crotch. However, she felt something strange as her crotch became aroused and her body started to heat up...