Fics like Ignorance is Bliss

From Prompt: Merlin and Arthur work in the same huge office building and see each other nearly every day. Merlin has no idea that Arthur is CEO and flirts outrageously with this random hot guy he keeps seeing on the elevator and in the lobby and around town. Arthur flirts back and doesn't let on who he is. Late night office sex happens and keeps happening. Cue complete mortification and/or anger when Merlin discovers he's been having sex with Arthur Pendragon, CEO of Pendragon, Ltd, his ultimate boss.

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