the miracle came with a pop (смешанная)

“The cupboard under the stairs?” she read, puzzled. She distinctly remembered her own letter being addressed to The Left Bed In The Second Room To The Right, back when Tuney and her had shared space and dreams and a sisterly love that she still sometimes missed.
“What?” She heard Sirius croak, behind her. He’d been occupied glaring at Severus and also glaring at Peter’s still body. When Lily glanced at him, she discovered he seemed to be in a bigger shock than hers. Perhaps, she thought, his death had been more gruesome than her own, and he needed more time to process it.
"What do you mean?” Minerva asked, but the child kept retreating and she stopped before approaching him.
“That’s why it’s mine!” he repeated, and caressed the envelope carefully, like he wanted to erase the rumples with his blackened nails.
 
(or: the one Time Travel AU where several parental figures in Harry's life plus Harry himself (aged 11) travel back in time to the Marauder's Era. Featuring koala!Harry and a very bitter Severus Snape)