Storybro's Magically Lewd Sleepover Adventure

It took us a slight amount of time to understand how github worked, but we wanted to contribute this greentext story from R9k, /b/ and /v/. Considering it went on for a full month of constant threads and is (As far as we can tell) the longest 4chan greentext story that's ever been posted.

Hopefully the formatting in the file is properly done and we're sending this pull request to the right place.