It would be a plot twist if snake boi has some fatherly affection towards the MC. Seeing him as a younger version of him with some nice, very nice eyes.
If he can get the regeneration part and the Kaguya bloodline to go with it then he can be even stronger since Kimimaro really was strong and could have been better if he wasn't dying.
Oh? But what will YOU want in exchange Orochimaru? There is always some sort if catch or favor one must pay to the snake in full lest they be devoured!