Bros reacting to s/o cheating?

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Shuu:

-If he’s not too attached to you, you might get away with it, if only because killing the new partner is too much trouble. If he does care to interfere, it’s a quick, violent death for whoever was involved. 

Reiji:

-So long as you’re in public, he puts on a polite act and gently guides you back home. Then, it’s a punishment the likes of which you’ve never experienced before, and quite possibly, a dead human. 

Ayato:

-He quickly and brutally kills whoever you were involved with, and traps you in the mansion for weeks for “training”. You have to learn that he’s the only one you need, no matter what that takes. 

Kanato:

-Honestly, you should know better. He’s so possessive he might kill both of you in a fit of rage. At the very best, you’ll be turned into a mostly-living doll and your unwanted lover quickly disposed of. 

Laito:

-You expect him to be angry, but he seems almost happy about it. He actually asks you to bring your new lover over so all three of you can have fun together, and you’re pretty sure he’s serious. 

Subaru:

-You’re lucky if he doesn’t just punch through the new lover’s head. He’s sorely tempted to end them in a spray of red mist, but, held back by the part of him that’s just hurting, settles for punishing you brutally. 

Ruki:

-He punishes you for even trying to think for yourself. Cheating on him is a sentence to a lifetime of reform, courtesy of a very upset Ruki who now knows that you can’t be trusted. 

Kou:

-If you thought that was okay, then you can’t have any complaints about what he does next, right? Even if he decides to love any other fans, you’ll have no room to protest, after what you did. 

Yuuma:

-He loses his temper almost instantly, and kills off your new lover before you hardly know what’s happening. From that point, it’s a matter of what punishment his infuriated mind can come up with. 

Azusa:

-You’re going to regret cheating more than you ever knew was possible. Not because he’s angry, no, but because he’s so sad, like a kicked puppy that you shoved over and stepped on. 

Carla:

-Apparently, you were allowed too far from his control. In the future, you won’t be so much as leaving the mansion, now that he’s seen what terrible choices you make when left to your own devices. 

Shin:

-Since you thought betraying him was a good idea, even if he hardly cares about you, you’re going to pay for it. Somehow, the cheating hits something personal and raw, and all he wants to do is kill.