 If you liked
Death March kara Hajimaru Isekai Kyousoukyoku
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 ...then you might like
Izure Saikyou no Renkinjutsushi?
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both have working adult MC isekai into a teenage body
both have slaves although one treat them like employees and the other family
both try to live the laid back life but are too overpowered
while Takumi from alchemist his more upbeat Satou more calculating so able to hide his op skills easier and while Takumi seem oblivious to his haremettes feeling satou most likely know their feeling but act likely he doesn't because of the the mental age difference