Petunia was not there when the man arrived but if she were she would have expected it to go as follows.
“Tell me, where is Ms. Petunia Evans? I have some business with her.” The mystery man would say.
And, Lloyd, idiot that he was, would say, “Well, why don’t we go visit her together?”
Fortunately, Lloyd is not quite the fool his friends believe him to be.
And, based on his retelling, it went something along the lines of.
“Tell me, weird American wizard, where is the vile Petunia Evans? I have business to take care of.”
His response, hero that he was, was, “Foul British wixen know no propriety. I’ll not be giving you the knowledge you seek.”
And then the man brought out his wand and threatened Lloyd, which led him to immediately calling Petunia and asking what he should do.
“Don’t be an idiot, I’ll be there soon,” Petunia told him.
Telling Ursula she’d be out for the day, she gathered her things: her wand, a knife, and an enchanted ring imbued with protection charms.
She approached MACUSA as if she was going to brunch, with a smooth step and an extremely expensive outfit. The sleek satin of her clothes and the clack of her heels, made heads turn, but she paid it no mind. Instead, she went right up to Lloyd’s office, where the usual predatory man ruled with an iron fist.
Today, however, he was sitting at his desk sweating.
And a man with oily black hair and a hooked nose was lounged across from him in an all black cloak.
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“Lloyd, get yourself together. He’s not going to avada you.” Petunia snapped, turning to the man she would recognize with her eyes closed.
“Severus, what are you doing here?” Petunia's lips were pressed down, in as much of a frown as she was willing to give.
“Oh, I think you know.” He glowered at her.
Petunia, to her credit, did not immediately draw her wand.
“I believe my letter was clear.” She simply replied.
“Tell me, how did a muggle come to work with MACUSA?” Severus sneered.
Lloyd, not too frightened to still be a racist, angrily said, “Hey! Mind your words, Wixen!”
“Oh, shut up, Lloyd,” Petunia shot, before looking back to Severus. She figured now was the best time to be honest.
So, she withdrew her wand and with a swish and a whip and a mumbled ‘expelliarmus’, Severus’ wand found its way to Petunia.
“Does that answer your question?”
Lloyd visibly relaxed now that Severus was unarmed, but was looking a bit put out nonetheless.
Severus maintained that bored expression he’d always given Petunia, but he couldn’t stop the widening of his eyes that relayed his shock.
“A witch? You?” He spat.
“A witch. Me.” Petunia confirmed, twiddling both wands in her hands mockingly.
“Assuming that’s true, you’ve had no magical education,” Severus sneered, standing up and expressing his full looming height, “So you’re hardly qualified to wield that wand, at all.”
At that, Petunia laughed. Full and hearty.
“Okay, freak,” she hissed, bringing back every bit of the horrific human Petunia had been before, “Then there’s no need for this conversation.”
“The boy needs to attend Hogwarts.” Severus ground out, “It’s for his protection —though I doubt you care much about that.”
Petunia slid her wand back where it came from and held up Severus’ own wand, “I’ll snap it if you don’t bite your tongue.”
Severus, remembering how unhinged Petunia could get as a child, rightly assumed she wasn’t joking.
“Very well,” he sighed, “Can we talk somewhere private?”
Petunia smiled sweetly.
“No.”