I'm not the best at creating stories, and I didn't want the story to get so mushy, it distracted the people reading the story from the plot itself. It was a simple one-shot. I usually can't create long stories as I suffer from bouts of serious writer's block at times.
What Ryuuka is trying to say is that the story needs more depth into it, seeing as it's a shipping fic and all. In a one-shot, there's not really much of a plot, or rather, the story is mostly character-driven, so what you need to be focusing on is description and character interaction, as opposed to just moving the plot along for the story's sake. This goes doubly so for shipping/romance fics because the readers
want to see how the characters would react in a situation wherein their
emotions (i.e. love) are explicitly described (Part A) in tandem to
their actions (i.e. blushing, shying away, etc) (Part B). Why the story felt so empty was that, as Ryuuka said, you just described how the characters reacted, using Part B of the two part formula, without actually exlplaining to the reader
why Dash felt that way, which is Part A. Personally, I found this funny because a lot of writers tend to just use Part A without actually having a Part B to back it up. That is to say, telling without showing. You did the opposite, showing, not telling. xD
Hope this helps in your future writing endeavours. I'll get around to reading yours sometime, AK.
NB: I use the terms Part A & B for a simple explanation, not that people actually call it that.