Hi, just found your previous thread and since your Bella is already fixed he can't get her pregnant (male rabbits are able to do that up to 4 weeks after neutering). I am very glad to hear that they are getting along well, the only thing could be that George is showing signs of love and grooms her that means most of times that he will be humping next. Which could potentially cause problems because if she doesn't like it (humping, not grooming, grooming like all bunnies) and if he will keep chasing her she can a) find a hidey place and stay there until he calms down and b) can show some patience and when it's gone she can start chasing him back and humping him, which can be pretty bad because can lead to fights and also they can damage each other's genitalia. Which happens pretty often.
I had my girl in a horrible state after she tried humping her new bonding partner (neutered 8+ weeks) and he didn't like it, she was humping his head. He's normally a very calm and sweet rabbit but humping is humiliating. So her ****** and all around was one massive bleeding wound, you don't want to see it. They spend very happy 2 weeks together in a neutral small territory, they loved each other. Then things went wrong.
Another example was successful I adopted a spayed female and bonded with 7 months old intact boy. He groomed her a lot first week or so then started humping and spraying her and walls. I hated it but that girl is very easy going and she didn't mind, I made a few hidey places for her where he can't access her so when he wasn't humping her they were good groomed each other and all, then if he starts humping she's running away and hiding. He is neutered now nearly 8 weeks and since they were together for 6 months and never were aggressive to each other, I didn't separate them at all, after his surgery he kept humping and spraying, but every week it was less, now it happens but really rarely, like once a week. I believe he will stop completely after a few more weeks.
So it's up to you and watch your rabbits. I would personally not let them be together without 100% supervising, at least for another 4 weeks. And if you give them playtime together watch then, he might be humping her soon, watch how she reacts, if she shows any sign of aggression, goes after him, I would separate immediately because fight can go really quickly and you won't be able to stop it even if you are there.
In other words, it is risky. And depends on your girl, but also she can be fine at the beginning but then can lose her patience unexpectedly. If there was a major fight it will be very difficult to bond them after.