I enjoyed this.  I agree it felt a little rushed at the end, but it didn't really hurt the story; this felt much more focused on the set-up stuff, which was handled quite well.  Second person perspective is tough to write (I've tried it in a few of my stories too) because you run the risk of making the reader feel thrown off by having facts about them told to them, but I think you pulled it off fairly well.  I found it odd that your main character didn't just play dumb when the younger sister asked about his fetish rather than blindly confirming it like he did, but I understand it was to move the plot forward.  The religion theme brought in near the end was nicely done, and played up well without bogging down the flow of things.  In the future, though, I'd say it's a bad idea to bold/caps lock giantess dialogue, as it loses any sort of natural inflection.  Still, a nice job.  I'd check it out if you added a little more to the end after the main character is discovered.