I've never read those books so I can't comment, but I do know that generally speaking the supposed good guy committing rape is a fast way to kill a story for me. It might get a pass with a reasonable drugged/crazy/mind control excuse, but other than that, no. (I am making the distinction between 'good guy' and 'protagonist' here.)

If you want to read an interesting feminist deconstruction of the animal companion genre, try "A Companion to Wolves" by Elizabeth Bear & Sarah Monette. It's wolves, not dragons, the companions are all men, and the wolves are pretty much the dominate partners.