Replying...
Intro. cross finally got rid of his dark past, now living in the omegatimeline (I think that was the name, it's been a while since I saw Underverse), but despite the safe environment, he was still suspicious and avoided interactions, probably due to the trauma of having any connection with anyone, but dream, the guardian of this universe, tries to change that (you can interpret it however you want)

Cross!sans x Dream!sans

@yari