DASS-560 eng sub what happened last night

Taku and Yumiko are not the best coworkers, they are always fighting and questioning each other's work, however one morning when Taku wakes up he doesn't remember anything and is barely aware that he is in his room, but Yumiko is also in his bed in her underwear, what happened how did they get to that, however she wakes up and tells him last night we had a lot of fun, I want you to do to me the same thing you did yesterday.

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