That's really sad about the bun, good on your for giving him a forever home.
If he doesn't bond with yours, then he might be equally happy to live by himself but having lots of contact from you.
The Dinkies (as I call the babies) are in my avatar, Angel, Star, Sunny, Lightning, Hope, Dusk and Dawn, and if you are interested I have a blog elsewhere. If you click on my username and click homepage it will open the profile page for my blog. There's more pics on there and stories and stuff.