Percy/Oliver
The only thing Oliver noticed about Percy Weasley was how adorably awkward he was. Any association between his actions, Percy's blushing and secretive feelings remained blissfully undiscovered. Searching for subliminal connections was not one of Oliver's habits; on the contrary, he believed in blunt honesty. What a person said should be what a person meant, which was why he was precise with his words and careful in his decisions.
Well, most of the time.
'So do you have any?' Oliver asked, ignoring Percy's stuttering. 'Proof, I mean.'