I barely remember the storyline but it goes like FL has somekind of super power that help ML feel comfortable and sleepy. I think it has scene where the ML fell asleep while hugging FL on sofa .
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I'm not sure if this is the one you're looking for but it kinda reminds me of this manhwa. https://www.mangago.zone/read-manga/as_the_heart_leads/
Well make sense for the plot but i wish FL do nothing and just be homebody like honestly be true to the tittle for once !!