Bugs and Evie are almost ready to move in together. They both flop many times during the long sessions, groom each other, and will occasionally snuggle. However, Bugs gets defensive when she approaches him. He will jump up and face her and will nip her if she sniffs him. She doesn't like this and will nip him back and then a scuff breaks out. He isn't scared of her because he will flop into her and give her lots of kisses. Sometimes he nips her and sometimes he won't. If I touch his back when they're together, he will jump and face me so I know the behavior isn't directly towards her. I don't feel comfortable being anywhere else than inside the pen when they're together because he's unpredictable. I want to be able to trust them, but until he stops nipping at her, I can't. Is there anything I can do to help him? The areas are made neutral and the sessions are happening in my 4 foot by 4 foot xpen. Should I put them into a smaller space and when he stops being defensive, put them back into the pen? I'll attach a few pictures of them.