Hanasaki Koharu has been married to her husband for three years, but her husband often has to go on business trips for a week at a time. When she was bored, her friend, who was busy, sent her son to her for a few days. She met Shota once a few years ago. The boy was quite studious but seemed a bit naughty and especially seemed to like her breasts... Because Shota was still young, Mako often let him do whatever he wanted with her breasts. She also agreed to bathe with him, and rub his penis when it was erect. And fire near straw will eventually burn. A sexually deprived woman and a boy who liked breasts gradually crossed their boundaries...