I don't really believe that your path is as set as you think it is. It seems to me you're experience with humans and a normal life has been too limited to say what will never happen.
But for the record, I'm sure Kitten loves you too. And loves you to love him, because he's greedy that way. But what he wants most is what Sunny can offer him. Not you. Not me. And even if he shies away from putting it in words, his actions make his decisions clear.
But if you're going to be second fiddle, you may as well be the best damn second fiddle you can be.