Alternative twist on the “married in Vegas” trope:
Some Auror party or other and the trio is flat-out drunk, when Ron is like “so mate since Ginny’s dating Luna now we need another way to make you a Weasley”
Harry wakes up the next morning with a massive hangover and barely any memory of the night before. Drags himself to the kitchen and nearly gets a fuckin heart attack
Because
Taped to the fridge there’s this purple Ministry certificate testifying to the adoption of one Harry James Potter by Ronald and Hermione Weasley-Granger
YES!