Author: drwritermom
Other pairings/threesome: Tobias Snape/Eileen Prince (past)
Rating: Teen and up
Word count: 2657
Content/Warning(s): Medical jargon, cancer, implied past domestic abuse; sorry, no smut
Prompter/Prompt: No. 38 from torino10154: Snape has what appears to be a terminal illness. Harry searches for a blood relative who can save him. He must have a second cousin somewhere, right?
Summary: Severus Snape has Chronic myelogenous leukemia, a blood cancer rare in wizards. Harry enlists the help of a commercial DNA laboratory to find a compatible donor. Both are shocked by his closest DNA match.
A/N: JKR owns the Potterverse. I own nothing of value.
Read on AO3