There weren’t many specifics so I decided to make it just general headcanons once they know! I hope that’s alright, and that you enjoy!

Shizuo definitely wouldn’t like it, though I think he’d be more passive-aggressive rather than directly hostile.

Unlike Akabayashi.

Akabayashi totally threatens Shizuo, through a phone call or text most likely. He also threatens Shizuo face to face, but only when both you and his younger brother Kasuka are not present.

He has some level of respect at least.

This is between him and Shizuo.

Eventually, the two settle and come to an agreement.

They would let you decide.

You were not a piece of meat to be fought over after all.

They still give each other dirty looks any time they see the other out with you, but that’s the extent of it.

They were also competitive, but they made sure it’d never escalate to actual fighting.

They’re both too worried that you’ll leave him if you see him let the other get to him to that extent.

Once you decide on one of them the other backed off immediately, despite how devastated he was.