TIFU by letting my brother put a hifi in my bedroom

This happened a few months ago and is still on going, my brother was renovating his bedroom and decided he wanted a hifi, a decent modern one that can do music streaming but also CDs, he bought it and some speakers but when he went to install the shelf to put it all on his studs detector kept saying there was pipes in the wall, at the same time i also cleared out my bedroom and made some space atop a set of drawers for my RC Pond Racing Yacht (you see where this is going?) that needed some work, it was a nice place to keep my little woman of the ponds and maintain her.

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Well turns out that since the hifi couldn't go in his bedroom, he started eyeing up that lovely space in my bedroom, he talked me into it, there was nothing i could do, he told me i could use it too and listen to my music on it, and i assumed he wouldn't use it much.

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This was only a small hifi box, i could put my boat on top of it maybe, that's when he brings in one of those amazon alexas with the screen! i had no choice but to let my boat be buried behind it all, all i see of it is a mast and sail sticking up from behind the speakers.

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We set it up and the sound quality was amazing, tried out some of my music and it sounded great too.

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But 2-3 months on, my brother insists on using this hifi every night, so i have no privacy, he plays awful music as well, some sort of annoying electronic song called I-Robot (i thought that was a movie with will smith in it?) literally almost every night, or the radio, and where i sit i'm right in front of it and my headphones don't have noise cancelling, he sometimes turns it all the way up to annoy me, worse still is that i'm not allowed to play any of my music on it anymore because 'it's crap' he played about 30 seconds of a spirit of the glen CD i had and said 'who listens to this crap?' he also insists on having the speaker covers removed even though i think it looks trashy.

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Today he tells me there's something i need to see, i thought it was an early christmas present or something, i go in my bedroom and there it is, a big box with a picture of a subwoofer on it, he then says i need to clear space for it and in return i can listen to some of my music on it, where he wants to put it i currently keep a printer so i'll have to move that.

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TL;DR: Let my brother put a hifi in my room, now he is slowly taking over my room