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https://bangtanofyourdreams.tumblr.com/
Contains: One Shot imagines, MTLs, reactions, and a "describing" series.
I TAKE REQUESTS!
...if I like the ideas given/haven't done something too...
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Jin would not be having it. He'd be pissed off with both you and the person that you were flirting with. It wouldn't make sense for you to do something so petty to get his attention, and he'd think it was childish to do so. He'd argue with you about it for a long time, and you'd end up regretting ever trying to make him jealous.
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Yoongi would act like it didn't bother him, but he'd still be in a bad mood for a while. Like a week later you'd ask him if he wanted to go out for a night on the town, and he'd brush you off and ask if you'd rather go with the person you were flirting with before. He'd feel insecure, and probably would lose some of his trust in you.
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Hoseok would think you were being ridiculous and immature. He'd be incredibly offended, and would probably go off on you in front of the person you were flirting with. It'd be awkward for everybody, and it would convey the message that you should've never done that. Then, when you two got home he'd talk to you again about how poorly that had made him feel.
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Namjoon would roll his eyes at your behavior. He wouldn't know that you were that desperate for his attention, and would be disappointed that you'd go about it in that way. He'd probably ignore you for a day or two, considering the fact that he wouldn't even know what to say to you. He'd think the entire situation was utterly preposterous.
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Jimin would be tremendously annoyed. He'd call you out on it on the spot, and he'd call the person you were flirting with out too. He likes people's undivided attention, and for you to flirt with somebody else would be the end of the world for him. He'd think he wasn't good enough for you anymore, which he'd worry about whenever he was having trouble sleeping at night.
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Taehyung would scoff, due to being intensely irritated. He'd think you were trying to piss him off purposely, because he'd think you would've known how aggravating that is to do. He wouldn't tell you how bothered he was, but he'd show it through his actions. He'd probably be curt with his interactions with you, and would just want to be left alone.
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Jungkook would partly be annoyed, but mostly he'd be hurt. A little competition is a motivation for him to be his best, but he'd much rather be the only person that you paid attention to. Instead of actually trying to win over your affection, he'd probably just become aloof and devote more of his time to non-romantic things, because he will have given up after that.