Ok, I was thinking it's yaoi and that guy's eating the diugh. I mean it looks like the boy is going for the diugh, the way he's blushing and everything.
keonas said: She's 16, he's 10 and they're dating, canon.
Yeah. Maybe that's the story. But the picture shows a 16yo boy about to touch a topless 10yo girl. It is what it seems. Edit: Even if their supposed age is the other way around, it's still a bit too soon for a relationship for them.
I'd say it was on purpose; it's a texture of various colors. It's also easily noticeable on the full picture, I'm sure if it was a mistake he would notice it. I know no software that would have a backsplash like that that could be overlooked so I'd say it was just for aesthetic experimentation.