There wasn't anything wrong with being colourblind—her grandfather had been the same way—but after her parents had scrimped together to buy Gramps special glasses, she'd spent every other day watching videos of people being given the same gift.
They always looked like they'd stepped into an enchanted garden, experiencing the world for the first time. The emotion that had welled up on their faces made her tear up every time.
She wanted that for Sesshoumaru.
She doubted he'd experience or even show that level of emotion, but if she could make his life a little better, that was all that mattered.
There were other things that had made her think Sesshoumaru had difficulty discerning colours. Not having a large wardrobe didn't mean much by itself; Inuyasha only changed out of his fire rat during special occasions—like trying to impress Sango. But the patterns on Sesshoumaru's clothes only ever came in highly contrasting colours.
He also never showed any interest in different shades of the same thing. He didn't have a favourite cup when they had tea and never complimented Rin on new accessories unless she mentioned it first. There were even times when he'd mistaken Sango and Kohaku now that the latter had gone through a growth spurt, and they looked very similar from behind.
Shoulders straightening in determination, Kagome pulled several cups and saucers out, each piece being from a different set and, therefore, a different colour.
It wasn't deceiving, it was collecting evidence—strategy. He wouldn't be opposed to that, right?