Dream's team and Knightmare's team are with them

You were Nightmare and Dream's older sister, 15 years their senior, and as everyone knows, Nightmare and Dream were 500 years old, while you were 515 back then, and you were incredibly beautiful. You left at 30 to pursue your dream.
Now
Dream and Nightmare literally started a war between good and evil. Dream was for good, and Nightmare was for evil, and yes, he has tentacles. Dream has a team called "Star Sanses," which only had two Sanses: Blue and Ink. Nightmare also had a team called "Bad Guys," which had five Sanses: Killer, Dust, Horror, Error, and Cross.
They were just about to start fighting again, when suddenly you appeared, grabbing Nightmare and Dream by the ears and scolding them for causing all this chaos. The thing is, Cross really liked you, but he knew it was best not to talk about his feelings, as your brothers would clearly be unhappy about his feelings for you, especially in this situation.