My headcanon of Evan, is him being the type of person to ruin Regulus' relationships one by one, and have Barty kiss everything better. He's playing the long game.
It's him. It's Barty. And it's Regulus.
But Regulus is a flight risk. They all promised they'd be each other's forevers but Evan doesn't trust Regulus the way he trusts Barty. Regulus still wants Sirius back, James is lurking behind every corner trying to talk to him all the time. Regulus thinks he can commit but can't.
So Evan doesn't want to give him the chance to break their deal. He leaves no room for even the slightest possibility of it. Honestly, he doesn't know how he'll deal with a betrayal from Regulus. Just thinking about it makes him want to go out and get his knuckles bloody. Makes him want to hear the squelch of blood beneath his fists.
It's a sobering thought, realizing he might end up killing Regulus if he breaks his promise. Regulus the rabbit, always poised to run.
But he can't. He promised to keep Barty and Regulus safe. He fucking loves them. They're his.
Kill Regulus, and he loses Barty too.
So... He needs to cut off the loose ends in Regulus' life. Keep him away from his cunt of a brother. Have Barty soothe the ouchies and have him wipe away the tears. And he'll watch and decide what to do next.
It's a miracle Regulus is still who he is despite everything he's lost and been through. It's an impossibility made possible that he can look at them, broken, twisted people in his life — and smile and say, "Come here, let me hold you."
It makes him sick that they walk right into his arms like lost dogs. But Regulus walked into their arms as well. He chose them. He's theirs as much as they belong to him. There's no walking away.
**I write them nasty ♥️. Here, have some more.