My twin sister made me have random ejaculations

Sister-twin (13) is teasing me 24/7 and caused me to have uncontrolled ejaculations whenever I get horny.

Few months ago my twin Sara started being so teasy toward me. We both hit puberty (she actually did a while ago) and it is getting a bit awkward… for me at least since we still share room together and our mum can’t really afford to have it any other way even though she is always in work.
Anyway Sara hit puberty about a year earlier than me, but ever since she grew more curious about my (and her) body to such extent that it became a problem for me.
I was used to see her naked ever since we were little, however during the last year as I grew I felt really awkward and it didnt take long for me to start having wet dreams. I googled that it isnt bad, but the problem is her body is pretty much the only that comes in my mind and the dreams end up being her for the most part.
Given that we sleep in the same room and about 10 feet appart it became super weird for me. The worst part is that she started to wear less and less clothes over the year until it stopped at her being topless with just panties and with this blanket or whatever over her shoulders or in a bathrobe and since its mostly just the 2 of us at home alone no one is probably going to stop her.
It obviously can’t be difficult for her to notice that I get hard quite casually, there isn’t really much you can hide from your twin.
So in last few months she grew into being really touchy and teasy (on purpose obviously). She also started following me everywhere and since we share pretty much everything (school, classes, our room …) the only time I can get private is on toilet where she constantly waits outside. I used that time relieve myself but she figured that out started to blackmail me about it. School toilets are also quite of limit since they are always crowded with other boys.
This started me simply just not being to hold it anymore and cumming when I became too horny. It began once when we got home after a PE class when other girls filled my head for the day. We just came home and she just randomly got her tshirt off (as usually) and just randomly hugged me.
I couldn’t hold from the shock and just spilled everything inside my pants making awkward wet stain. She saw it (especially in my face), chuckled and called it dips on shower, she threw the rest of her clothes off, revealing her naked little butt and ran to the bathroom.
At that point my balls were so emptied I couldn’t even use this spare time for myself and just tried to change my clothes.
Now I becoming really desperate, I started cumming randomly in class just because a cute classmate smiled at me. I have wet dreams few times a week and my sister started crawling in my bed with me (sleeping only in panties) saying she is afraid or whatever, I even noticed she touched herself when she thought I was sleeping (or maybe she even knew I did not, can’t tell at this point anymore)… so much to say it made me cum literally on her but as my cock peaked outside from my pyjama.
I am now becoming a total wreck with close to any sleep, my grades keep me barely hanging and she pretty much controls me by allowing me to just be alone for some time when I end up sleeping but usually wake up due to another wet dream or basically her calling the free time is over…. she effectively turned me into her slave and a total wreck.

Some might say I should just fuck her or whatever, the problem is I don’t have the strength anymore… I can’t even ressist much less to do anything. I wrote this pretty much drifting into sleep while she is out with her friends and I got exceptionally much of my own time.

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