<human>: Can you provide a brief rundown of the text in within 3 sentences?

This happened a couple of days ago, but I just found this sub (Insta-sub, by the way) and I felt as if this belonged here. First time poster, pls don't punish me TOO hard daddies for any and all mistakes. Onto some backstory.

Siblings will fight over any inconsequential thing. This should come as no surprise to people with brothers and sisters, but sometimes they take your stuff without asking. All fine and dandy, I guess. But I got mad the other day, because this had been going on for a whole month, of her just constantly taking my stuff without asking, and just leaving it in her room, strewn about. She's taken everything from me, from expensive headphones, to chargers and culminating in my laptop lying precariously on her table, with about 2/3 of it off the table, with nothing but a miraculous chair being the only thing preventing my trusty jackintosh from meeting a fateful end. 

Revenge? Simple. A taste of her own medicine. Taking her stuff, having it dangle off my bed, per example. This begins escalating until our ultimate confrontation, where I take her gym headphones and walk by her, when gives me a glare and asks if I had EVEN asked her to borrow her headphones. (The gall!) I then proceed to calmly answer by stating that I was simply surreptitiously borrowing something of hers, like she had done many times before. Total. Fucking. Silence. 

I also used her toe-nail clipper and left delicious keratin remains behind c:
<bot>: Sister "borrows" a bunch of my shit, I plan my deliciously vapid revenge. By just taking a bunch of her shit. Never said I was an evil genius.