Ooh how sad and frustrating for you … it is not easy to bond … have you had bonding experiences prior to getting Cotton and Itty Bitty. I recall you had another bunny Laithe?
Bonding is definitely a job and a half … many of the girls/gals here have had bonding experiences … myself included .. not easy. Do you have a local shelter where you could perhaps take them together? Just a thought.
Personally, I would keep Cotton and Itty Bitty apart for the time being, particularly that IB is not spayed yet … things may settle down once she is spayed (I hope). Cotton’s bites sound nasty … Ouch … maybe keep him away from your face area. I know it is bad enough getting bitten on the hand .. the face no way.
Maybe you can have another go at bonding once IB is spayed and try again in a neutral area where neither bunny has been.
Have you read the ‘Bonding’ section here on BinkyBunny … it is very informative. You might like to take a look.
Dawn xx