Since they are still babies, they will be as lovey as they can be since they are scared and aren’t their true selves yet, but they can still stay lovey towards you, it really just depends on their personality and how well you bond with each one, and of course when puberty hits they can get really bad habits developing so fixing them will help them. Personalities don’t change when they get fixed, only their poor bathroom habits and their poor habits go away. They become a bit calmer most of the time after and they are still lovey dovey. But of course you’ll want to keep the boy and girl separate at all times until they are fixed