Is your girl dominate? My girl is disabled but is very timid and submissive, she’s big on licking everyone, any bunny would’ve got along with her and I bonded her fine with the boy.
Today I caught him humping her again (weird) They’ve been bonded for 6 weeks now. I just pop him off when he’s humping her and she is trying to run.
There was never any aggression showing on both buns, no biting, no fights, just the boy humping – she attempted to a couple of times but fell off backwards when he moved.
Just have to keep a close eye on them during bonding sessions. Fortunately mine was bonded as soon as his hormones died down. I let them live side by side for 5 weeks (he was spayed and adopted a week before). During this time, I swapped them around each others pens throughout the day, I had to cover one of the pens as he went bonkers when he sees her, I uncovered them during feeding time facing each other through the pen (veggies/pellets), then without the pen but separated them again once one was done eating, slowly did uncovering session times to let them see each other more often.