 If you liked
Shougakusei ga Mama demo Ii desu ka?
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 ...then you might like
Sewayaki Kitsune no Senko-san
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Similar plot : a stressed male protagonist who works way too much suddenly gets a cute motherly loli to take care of him. Wholesome content ahead.
There's also some supernatural elements and both duos include a reincarnated person who used to know the other in their precedent life.