Is this the ojisan that got laid the night he arrived in the other world? If it is I tried to read the manga, and that part kinda caught me off guard because everything started wholesomely... he living an ordinary life in his original world, then he got isekai'd to another world, then he met a girl who I thought he would treat as a daughter but nooooo...
I tried to overlook that part because it came past quickly, but when the furry and aristocratic girls came—I decided to drop it...not really fond of harems—even if romance won't be that focused because my ship in harems usually doesn't flourish, so better avoid any incoming emotional damage...
Anyway, the concept was interesting tho if not for ecchi and romance (harem). Btw, thanks for sharing :>