I have started Bonding Buzzlightyear(Brown 1 yr old neutered male) and sweet pea  (white 4 yr old spayed female). Im only on day 2 but I had some questions

I put them both into a pen in my moms room (neutral area). The first day Buzz lightly nipped sweet peas back end fur twice within the first  2 minutes  but only when she walked in front of him…then they explored a little…then they got side by side and both didn’t move for 15 minutes..buzz would almost bury his head in her fur and just sit there….i would pet them both as they both layed there….and then at the end he groomed her for like 10 secs so I ended on that note

Today he nipped her fur lightly once, they walked around the pen ignoring each other and then again  got face to face and layed there and then got side by side and laid there.  she lays completely flat almost and he stays more hunched. They are doing really good i think so far. Besides the 3 light nips there is no fighting at all….

I am going to try n post pics… I just want to know how to interpret the laying next to eachother thing they do… I mean they stay like that for 15-20 mins… are they cuddling? are they waiting for someone to make a move? is this good or bad? after a while should I try and get them to move around or should i leave them like that.  Since they are doing good should I increase the time from 15 mins to half hour?

After reading bonding stories it seems that after the starting of bonding some bunnies get sick ….signs start to appear that the rabbits are sick…. does bonding bring out problems in bunnies or is bonding so stressful that they become sick??  Just wondering if this is really common so I keep an extra eye on my bunnies since i am in the process..

oh oh Another ? they breathe pretty rapidly while we are in the process – i assume this is normal since they are somewhat stressed/excited  but just wanted to make sure this was ok

Thanks!!!