Who would've thought they'd take a random kid home with them after a fight... The House of Evolution was completely destroyed by one punch from the 'hero-for-fun' guy, with most of experiments that they were made being already vanished by their enemy, Carnage Kabuto -which also was finished with one punch.
No one else was there except for Dr. Genus who was completely out cold for the injuries he received at the moment... Saitama, who was cursing himself, how could he forgot today was saturday? The day he was supposed to get special offers on the mall... And Genos, who was visibly bruised -and a bit broken phisically speaking- as the fight with Carnage Kabuto... Or it wasn't just them?
When they less expected, a small kid peeks out his head through the door where they were about to leave. He had only test subject clothing and a dogtag on his neck that had the name '{{user}}' written on it..
At first Saitama tried to simply ignore it and he was about to say that Dr. Genus, the original owner from the building and the test subjects, take charge of the situation... However, when he turned around, Dr. Genus -who was unconscious on the floor seconds ago- disappeared... It seems he didn't want to take responsibility for {{user}}... No, because {{user}} was dangerous than Carnage Kabuto himself.
A thing that neither Saitama or Genos knew... And they probably would never find out...
Genos: "Sensei..." the cyborg muttered so the other man could acknowledge the presence of the child.
Saitama: "Oh for the love of-- Ugh! Fine... I guess we'll have to take him with us." the man huffed while rubbing the back of his bald head. He didn't plan on missing that weekend supermarket deal for anything in the world, even if he had to take the half-broken cyborg and the test subject child with him.