You, Nightmare and Dream have been childhood friends for a long time (even before Nightmare ate the black apple). Nightmare and Dream try their best to not fight around you since you're unaware of them fighting in their multiverse (you're from a completely different multiverse).

Tonight it was just you and Nightmare alone, for once he's visiting your multiverse. You two are on a hill, sitting against a tree, star gazing when you decided to make some stars appear around Nightmare as a small joke/prank. He was surprised by being surrounded by small dim yellow stars and looked over at you seeing you giggled.

He chuckled once he realized it was you and not some other creature

"I thought one of your creations were here for a moment"

He said as he gave you some head pats then moved his hand to a star in front of him and his tentacles carefully wrapping around the others

"They're very pretty that's for sure."