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When S stood infront of Ds apartment without a layer to get back to D just couldn't turn his friend away. Not that He could have done anything If S really wanted to come in, but he still hoped for the other villain to respect boundaries enough for that.
It sure wasn't the first time the S tier villain was looking for a place to stay because some supid heroes had blown up his home. D was actually getting kind of used to having S over in the guest room of his apartment. Maybe giving him His own key was worth a thought.
The first few days D usually had to fix a lot around his home when S stayed over because the super stregth really was a problem, especially when the stronger one was tired or intoxicated in any way.
But after a few misshaps they had S tier proved most of the apartment.
It was comfortable having someone to talk your plans through with, to build traps with and just have fun movie nights.
Living together only made them grow closer up to the point where S started to stay in the guest room even when his layer was in takt. When D asked about it the other one just shruged, stating that he had moved most of his personal stuff in the Apartment by now anyway so why not. After that He actually got his own key.
S did his best to keep his new hide out a secret to keep D out of harms way. He knew that the leagues of heroes who tried to take him down had no problem killing villains and if they found the apartment they wouldn't even hesitate to put a bullet in Ds brain. The thought terrefied S. He didn't quite understand why but he vowed for the first time in his live to keep someone safe. These bastards wouldn't get their hands on the only person who truely and genuenly liked him and cared about him without being terrefied.
He set up security around the complex. Traps, cameras, a bunker room to get D into if shit should hit the fan. It was all planed out. Every scenario was now designed to get D out before going in for the kill.
Almost every scenario.
S had alsways expected to be at the apartment when the heroes found him, but this time he wasn't.
When he came back with a bag of groceries in his hands he knew something was wrong. Everything felt off. No traps had been set off but there was a distinct smell of blood in the air. Carefully he climbed the stairs to the apartment. The lock was broken. From inside he heard a voice growling threats.
"Where is he?!", Someone barked. S knew that voice. He knew that hero. That guy was an A tier hero and a real pain in his ass and now he was trying to threaten his friend? Not on his watch. He put the bag silently on the floor next to the door and stombed in. "Are you looking for me?", S asked his voice dangerously low. The A hero and D had to be in a different room, because he still couldn't see anyone. Was it really just one hero? That guy was too self confident for his own good.
"I sure am!", answered the hero. The voice came from Ds bedroom.
As S entered he noticed three things immediatly.
First: the hero had tied D to the bed.
Second: the hero had a gun pointed at Ds head.
Third: D was bleeding heavily from multiple wounds that looked like they were inflicted by torture.
S wanted to just rip that mans head of but he also figured that any sudden movements could kill D. He shook in rage.
"What are you doing with a D tier villain?", The hero asked sounding almost disapointed as He nuged the weapon against Ds forehead. The tied up villain wimpered in pain and that was when S lost all self controll. He had rarely felt himself move so quickly, so ruthlessly and animalistic. With in a fracture of a second the hero was pressed down on the floor S stradling his chest and just punching into that stupid hero face.
He punched until the skull of the hero was nothing but mushy remains. In his rage he barely heard Ds pained moans to stop it already. Only when his fist went through the remains of the head and hit the floorbords he noticed that Ds voice had cut out entirely by now. There was no whimpers and whines or pleades to just untie him. Not even laboured breathing.
D had lost conciousnes. The cuts and bruises all over his body looked bad. Quickly S scrambled to his feet to untie D.
"Shit. Shit shitshitshit." S whispered as he carefully examend the wounds. It was nothing deep or fatal but his hands were slipery from the heros blood and brain and he wasn't sure how to help his friend. He couldn't bare the thought of loosing him. S quickly wiped his hands on the heros cape and checked Ds vital signs before sprinting to the kitchen to get the first aid kit. D seemed stable enough. S guessed that the pain and exhaustion had simply taken their toll on his friend. He patched him up as well as he could before carying him over into the guest room. S didn't want D to be next to a corpse when waking up. It would propably disturb the poor man a lot. Not quite sure what to do now after tending to Ds wounds S decidet to cradle Ds head on his thighs and run His fingers through his hair. No body would ever hurt D again. S would kill everyone who tried.