I’m just curious. I’ve only had a pair for going on 9 months. I know when I was bonding, Meadow definitely was the dominant one. She always requests grooming. No grooming resulted in nips on occasion. Fortunately, that stopped when she realized that nipping drove Max away, and she received even less grooming. She adores the attention. And Max always obliges. There was never any humping from either during the bonding process or after, at least not that I saw. They live together very peacefully now. But things have changed recently. They groom each other A LOT. Both of them will request grooms from the other, and both of them will freely and happily groom away.
But the humping. SO MUCH humping. 
It’s getting ridiculous. The other day I heard grunting and I looked over at them and Max was… humping her and grunting LOUDLY. Another time, they were right next to the pen wall and they kept crashing into it and I heard all the ruckus from that. Meadow never seems to care. She lays there perfectly content until he stops. She does not look afraid, she does not look angry. When he stops, she will go over and cuddle up next to him and groom him. Could it be that she craves attention so much, that even humping is a welcome thing for her?
They get along splendidly, I am just trying to figure them out for my own peace of mind. Much of the info I have relates to bonding, and not the relationship after the successful bond. Is Meadow still dominant, or is Max dominant now (or is he trying to be?) Can they both be dominant at different times?