"Excuse me?" Petunia Dursley said to her sister, shocked that she suddenly showed up at her doorstep at Privet Drive, cradling a baby boy who was probably her nephew Harry.
"Our son Hadrian was attacked by the dark wizard Voldemort and survived his killing curse. The curse backfired, so now Voldemort is dead and it's because of Hadrian! Now he's very famous as the Boy Who Lived and destined for great things! Dumbledore told us it's him, because Hadrian has a V-shaped scar on his forehead. V-shaped, like Voldemort, it's symbolic!"
Confused Petunia looked at her nephew Harry, the scar on his forehead catching her interest. "But Harry also has a scar. It's a lightning bolt, does that not hold any special significance for you freaks?" she asked Lily.
"I don't know, Dumbledore didn't seem interested in that. In fact, he said that Harry's probably a squib. That's why he should stay with you dirty muggles, so that we can focus on our famous son Hadrian and his destiny!" Lily said.
"And why should I take him in?" Petunia sneered at Lily. "It's not like you and that freak you married are dead, take care of your own baby, you deadbeat!"
"Because Dumbledore said so!" Lily said as if that explained everything. "Who cares what some senile old fool running a school for freaks said? Leave me alone!" Petunia screamed as she slammed the door in Lily's face. "Well, that was incredibly rude! Wait 'till Dumbledore hears about this, you horse-faced bint!" Lily screamed at her, but then she heard a familiar voice behind her.
"Hello, Lily." said clearly angry Sirius Black. "I had hoped I heard wrong, but it seems the rumours about you and James getting rid of Harry and trying to have him adopted by your cruel sister who hates you and everything connected to you are unfortunately true!"
"Yes, Dumbledore told us to do that and me and James agreed that's the best thing to do. We have to make sure Hadrian gets our full attention, after all! Harry would just get in the way!" Lily explained and if she were even a bit less self-centered, she could maybe notice by the expression on Sirius' face that his opinion of her sank even lower than before.
"You know, if you really can't raise Harry together with his brother Hadrian for whatever reason, why not have me take care of Harry? I'm his godfather, that's literally what I'm supposed to do!" Sirius growled.
"Alright, fine, you can have this brat. But if Dumbledore gets angry, it's on you!" Lily said as she tossed Harry into Sirius' arms. "Don't worry, I'll deal with Dumbledore!" Sirius growled, a look of disgust on his face. "But first, I'm gonna go knock some sense into James!"
It's a prompt based on the fanfic trope of having the Potters be neglectful, as well as the WBWL trope.
(WBWL: Wrong Boy Who Lived)