Prologue
"You know." The blonde man jumped half a foot in the air shooting the killing curse in his direction. He giggled. "See now. That was just rude you didn't even let me finish." A curse was fired again but he continued. "We don't particularly appreciate your usage or our insignia as your little logo, Gellert."
"And what would that be?" He had to give it to the dark lord he was quite unshakable.
"Why the deathly hallows of course." It was Gellert'd fault that he ignored the temperature drop as the room began to frost over, snowflakes dancing over the windows and floor like one would imagine a winter wonderland. "On that note, you've tainted my belonging for long enough." Gellert to his credit managed to hold on to the wand and extra ten seconds than he should have been able but in the end it flew from his grasp at a shadowed wall. A tanned hand darting out to catch it before the rest of the hands body followed.
"Who are you?" The man seemed to be trying to call his followers. The ones in Nuremgard where incapacitated and he'd warded off the castle so he had plenty of time.
"Honestly you'd almost hope one would recognise the owner of the title one was searching for so frivolously." He moved and sat cross legged on the table, in front of Gellert. "See I didn't have to talk to you, or even come here to get the wand but I have a proposition for you Gellert." The wizard wasn't stupid he connected the dots and wasn't so arrogant to think he could beat the man on front of him.
"What proposition?"
"Glad you asked darling now. There's a few things. I'm staying here, you are going to adopt a little orphaned wizard from England and I'm going to collect someone, she'll stay here too."
"And what do I get?"
"For starters you get a protégé/ son with a few conditions and second you get me, well me fighting on your side for as long as you're fighting this war."
"What conditions?"
"Smart man." he wiggled onto his belly and grinned. "You know of Horcruxes?" Gellert nodded. "Good, teach the idiot that they're stupid, remove you sanity, inhibitions and your pretty as fuck features. Treat him nice, no abuse. Look after him as one should look after a child. Don't force your shitty little opinions on him aaaandddd don't let him meet Dumbledore, at least by himself, your lover's an asswipe."
"And."
"Absolutely no type of harm will come to the girl I bring, she is mine and if harm comes to her you will suffer or whomever hurts her will, I'm not unreasonable."
"I can do that, and you'll fight by my side?"
"If that's what you want."
"It is."
"So do we have a deal Gellert Grindlewald?"
"We do, an unofficial one anyways. One I'm sure is subject to change should you not like it."
"Exactly. The names Harry, or call anything as you like." Gellert nodded. "Perfect. Come on bed time for all, it's late and we have things to do tomorrow, you also need to show me to a room." he cackled at the wandless stinging spell sent to his arse as soon as he hopped out and he skipped from the dining hall. The snowflakes leaving with him, as did the suffocating presence that Gellert would admit to no one, terrified him. He suspected Harry already knew however, but got up to follow him anyways.