Oh, I'm so glad you like this. I'd heard ages about the supposed scent of of redheads, and it occurred to me that I hadn't seen any use of the concept in fanfiction. Really surprising, considering how many redheads there are in canon.
And yes, when you made Neville a perfumer in your hpvalensmut fic, my jaw dropped. Although this is a logical career path for a Herbology expert.
And do feel free to picture Neville and Ron going upstairs at the Leaky Cauldron, and Neville enjoying that scent at length, from its truest source.