A Little Brother's Manipulation Trick...

I've always been the responsible one in my family, but lately I've started toying with an underhanded trick just to get a reaction from my little brother. See, he’s a neat freak and gets really upset when things are out of place. So one day, I took his favorite notebook... yeah, the one he writes all his secret stories in... and left it carelessly on the floor where he always walks past. And you know what? It worked! He was so frustrated that he came to me demanding to know why I would do such a thing. Of course, I played innocent at first... but then I saw how flustered he got, and there's this strange satisfaction in knowing that I can get under his skin like that. But here’s the thing: why am I starting to feel guilty about it? Is it just because of the way my mom looks at us when one of us is upset or is there more to it...