male bits

Hello , my boy bean was neutered back in July . He did really well with recovery and his testicle sack , now inflated looked great once it healed up . However I have just noticed some bruising and slight swelling on both the inflated sacks and it is now October . I check him out every so often...

So I just started bonding my pair. I have a boy and a girl bun that are both spayed and neutered. the boy was neutered about 4 weeks ago and the girl has been spayed for years.. My problem is, the boy bunny is humping a little too much and its his first time really doing that kind of thing. I...