We have 2 sisters Minnie and May. They were my girlfriends before she moved in with me. They are a both 3 going on 4. They have been living with me for over a year now. But recently Minnie has been overly possessive over me. Anytime May looks for attention from me Minnie Hisses and wacks her. No claw only paw. It's only been like this for about a month. Nothing has changed besides our Boi Frankie not feeling well( sadly has a mass in his mouth but surgery is tomorrow!!!!) . Note she also hisses when we move our legs under the blanket. Worried because she's never been like this. They don't cuddle anymore. Both are fixed. Help please...