Hiroyuki can't contain his excitement when his mother's friend Kotone becomes his tutor. - That's no wonder; not only does she have a well-shaped face, but her huge breasts further stimulate his excessive sexual desire... - Then, Kotone notices his gaze and begins to tease and play with him as if to vent her frustration. - Since then, Kotone, who visits him every now and then under the pretext of being a private tutor, continues to stimulate his lustful feelings and enjoys the hidden pleasure that her husband cannot experience...