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Vio had finally decided to accept the, now obvious, that Shadow was a being of feelings and thought, like himself. But he had to test out. Did Shadow have the same tickle-ness as Link and all the Colours had. He said he was practically the same, just different origins, yet same origins, so it was highly probable that he was. Now, to test out the theory.
The hero had long since figured out that Shadow would come to bug him if he stayed in the library for too long. So, that was where Vio started the plan.
He walked into the library, grabbed a book, and sat down in one of many chairs strewn about. Sure enough, after around fifteen minutes, the shade slunk in and made a bee-line for Vio.
Shadow flopped himself onto Vio's shoulders. "Hey."
"hello." Vio tried to keep the smile that was threatening to come onto his face out of his voice and demeanor. "What is it?"
"I'm-ahhh! Hahaha!" Shadow lept away with a confused look on his face, holding his sides, arms stuck to his sides. "What was that for?"
"testing out an idea. Your reaction proved that I was correct."
"and... What was that idea?"
"that you are ticklish."
"...what?"
"come here and I can help you better understand." Vio carefully kept his face calm and neutral.
"uh...okay?" Shadow forced himself to relax more and came over to Vio's side hesitantly.
And Vio promptly decided to tickle him again, this time knocking him over and trapping him.
Shadow screeched and started laughing, so much so, that he glitched a bit. Now wasn't that interesting. Vio stopped for a second in thought. Too bad for him, Shadow decided to get revenge and knocked Vio over, doing the same to him.
"haha! Now we're even!" He cackled after they tussled back and forth and were gaining back their breaths.
"and I got the information I needed. Many thanks to you, Shadow."
Shadow huffed, trying to sound irritated, yet his grin gave away that he really wasn't. "Yeah yeah, sure." He waved a hand lazily. "Just don't use it against me."
"no promises." And with that, Vio turned on his heel and ran away before Shadow could try to make him promise not to.