 If you liked
Yamada to Shounen
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 ...then you might like
Itadakimasu, Gochisousama
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Both manga feature a working adult (in his late 20s) who stumbles upon a high school student (on the verge of fainting) on a cold, snowy night. Both take the student home out of the goodness of their hearts..... and thus begins a unique tale of affection between the two!
Bonus: One of the MCs is a great cook and his future partner enjoys his cooking a lot.
Bonus 2: The student realizes his feelings for his senpai first.