I have a 6 month old male kitten (grey) and a 4 year old female cat (calico) both fixed. They get along really well and enjoy each others company but recently he has been playing extremely rough. every chance he can get he bounces on her back and holds her down. she tries to run away and hiss but he doesn’t take the hint. as you can see he’s very large and almost bigger than her already. she has scratch marks along her ears and neck. is this normal behavior? is there anything i can do to get him to just chill out and play normally with her?