You're not a poser, you're a writer of a lovely story, in a lump-in-your-throat, misty-smile sort of way.
I enjoyed your descriptions, from the vivid sunset to the chair stamped with George's personality. I found it very realistic and touching that Hermione would transition from feeling Fred's loss for others to realizing her own personal sense of loss. There are many levels of friendship, and although she and Fred weren't close, they were still friends. He touched her life and she misses him.
Hermione's realization about grief was moving. The only thing that jarred was the tense switch. The pov is third person, so it should've been "grief was" instead of "grief is."
Another thing I noticed was the dual use of "yard" in the first paragraph. I think if you edited yard to "garden" the first few times, and then changed "stood a couple of yards back" to "metres back" it would remove any possibility of confusion and, as a bonus, read more British. :D
Hermione worrying for Ron and him worrying for her, and the way they both took action was very sweet, as was the ending.
Thank you for ending with a smile. :)
Author's Response: Thank-you so much for your suggestions; I have made the necessary edits and agree that it now reads much better. I'm glad you suggested "metres." We don't use the metric system for measurement much over here in the U.S. and I don't know if that is a foot or a mile. ;) Thanks so much for this lovely review. I am quite a fan of your writing, so it means that much more.