[ Yes ]

“I'm going to stay here with you...” She was a bit taken back by this, but she looked a bit happy too.

“Why would you...?”

“You're in this world all alone! You have nobody here with you but your sister..who might just be an illusion. Who says she'll stay forever? I'm a real person..I'll always be by your side. I promise I'll never leave you.” She smiled a big genuine smile, and held on to my hand. I was so happy, so happy. It was a weird thought that I'd spend the rest of eternity in a colorless world, but with her with me it was more than enough.

“What are you going to give up?” Her fingers interlaced with mine, and she stared at me curiously liked I'd always done to her. 

“The same as you..my existence in the real world. That way nobody will ever notice we were there, or that we left. We can be happy here forever with no worries.”

“I like the way you think.” She leaned upwards, and kissed my cheek. This world had no color, but I still felt heat rise into my cheeks. She giggled at my reaction, I guess even in a world like this, there is still color.