The Daughter of a Fallen Aristocrat Becomes The Poor Knight's Maidservant/Official
Bernard is a fifth son of a minor noble family who he felt he had no choice but to become a knight to make a name for himself, and Lady Agnes is the flower of high society who should have nothing to do with a low ranked noble like him. Still, when he tries to introduce himself to her at her debut only to get glared at, he holds a grudge against her for looking down on him for years, which is why when she ends up with nothing after her father commits treason and comes to see Bernard at the knight's hall, he impulsively offers to take her in as a maid, intending to crush her pride. To his surprise, she's delighted and thanks him profusely, and now he gets to deal with housing a traitor's daughter who acts nothing like the haughty lady he was expecting. Still, a knight's oath is to protect those who can't protect themselves, so he can't turn Agnes away now! I like this one so far, especially the interesting touch of having it told form the ML's point of view, but it felt a little cliche once they introduced his mother and the "fiance" plot. Trigger warning: stalker.
Erotic Fairy Tales: The Little Match Girl