Help with a hentai manga

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I have been looking everywhere for this manga I read like a year ago, it's like an anthology of several erotic stories. I only remember the story. The first story was about a woman that had fantasies about being dominated by her boss at work. She enjoyed a lot when he degraded her and she felt aroused by that, then she tries to do bad stuff to him to provoke a reaction but she is not successful as her boss acts nicely. At the end she gets so desperate that she erases all the files that were due the next day, causing the boss to lose his patience and finally doing what she wanted. Another story from the same anthology is about a girl that invites his friend over and congratulate him for his new girlfriend, but she actually loves that guy and feels jealous, so she convince him to have sex one last time with her, but right after they finish, the girl knocks him out so that he won't tell anyone. It seems like the hit made him forget everything that happened, so she does the same thing every day, knocking him out to make him forget. At he end he was just acting and he remembers everything since the first time. If anyone knows the name of this manga please let me know...