kill somebody with kindness
kill (one) with kindness
To harm, inconvenience, or bother one by treating them with excessive favor or kindness. The phrase originated as the expression "kill with kindness as fond apes do their young," referring to the notion that such animals sometimes crushed their offspring by hugging them too hard. I love talking to Grandma, but she calls me twice a day to see how I'm doing—right now she's killing me with kindness.