Majime Cool na Kyonyuu Hitozuma Joushi wa Ore no Netori Haramase Onaho! | 真面目クールな巨乳人妻上司は俺の寝取り孕ませオナホ！

The protagonist, a dull office worker, has an ulterior motive for his boss, Ryouka. Although she is strict, she possesses a beautiful face and the finest body. However, she is married to a talented employee in the same company, so the protagonist gives up, thinking that he would never have a chance to put his hands on her.

One day, at a drinking party to celebrate the success of their work, the protagonist is able to make Ryouka drunk, and in the process, spilling the loneliness she has for not being able to be with her husband often, he then takes her to a love hotel, and bangs her to his heart's content.

Using the pictures he has taken during that moment as a blackmail, he repeatedly calls Ryouka and bangs her, torn between pleasure and the love for her husband, Ryouka finally succumbs to him completely.

Thus, by stealing someone else's lover, the protagonist's dream of screwing and cumming all over his strict married boss begins.