Luna came home with us when she was pretty young (8 weeks) and she hadn't learnt by then that biting hard HURTS. She was playing really aggressively with us. My kids would have welts on their arms and legs. So human Mamacat (me) stepped in and anytime she got being really rough I'd grab her by her scruff and hold her down gently and say loudly 'No Biting'. She quickly learnt what that meant and she stops now when we just tell her No Biting, no need to hold her by the scruff anymore.
Also helping is that once a week when we visit my Mom, we bring her over to play with my mom's 3 yr old British Shorthair who's doesn't put up with her nonsense 😅
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