[He won't deny it- he's confused pretty easily by things like this. Science wasn't his thing, and this definitely seemed like a science thing.
Sans pulls away from him, and Papyrus probably shouldn't want to just pull him back in, but he does. Instead Papyrus looks at Sans like he's a puzzle to figure out. Slowly, but certain in his himself and his words:]
...But you are Sans.
[Just like the Sans who was his Sans, when he was a Papyrus that wasn't him... Sans is Sans.]
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Sans pulls away from him, and Papyrus probably shouldn't want to just pull him back in, but he does. Instead Papyrus looks at Sans like he's a puzzle to figure out. Slowly, but certain in his himself and his words:]
...But you are Sans.
[Just like the Sans who was his Sans, when he was a Papyrus that wasn't him... Sans is Sans.]
You're still my brother.