Yeah, it does escalate quickly... almost "Is this just a parody perhaps?" quickly. I mean, see it in a different way.
Imagine it, not as a Hentai One Shot, but rather as the first chapter of a longer story. Then have it end on http://dynasty-scans.com/chapters/tall_and_short#8 rather than reading all of it. Up till there it was actually a rather cute if somewhat quick love story, which could easily be imagined continuing with them walking in mental circles around each other trying to find out what they're actually feeling.
So yeah I like it because of a good story, a good hentai, and a sense of not taking itself too seriously.