Neko ni Tensei shita Ojisan

Middle-aged, balding, ugly office worker who somehow still makes really cute expressions suddenly wakes up as a cat still with the mind of an ojisan and is soon adopted by his mean boss who secretly REALLY loves cats and names him Pun-chan and snuggles him and dances with him and sings silly songs about him and tries to kiss his cute little face. It seems like the protagonist just suddenly turned into an adult cat with no memory of how it happened, but if it is reincarnation, he must have been a truly evil and horrible person to have earned such a terrible karmic outcome ... even though he seems very pure. He takes it like a champ. Episodes are very short, very silly, and very binge-able.