dote on
phrasal verb
dote on/upon somebody
​to feel and show great love for somebody, ignoring their faults
He dotes on his children.
synonyms at love
Topics Feelings C2
e.g.
When I was younger, there was a bear cub I doted on like a little brother. 私には昔弟みたいに世話をした小熊がいた (/yupeco/『ゴールデンカムイ』12話)