When carrying out her usual daily tests on Oak's Shadow Dragon body, Twilight decides her friends need to be there for a very special kind of test. After all, not EVERYTHING she reads about in musty old books can be true… right?

Warnings: "Herm", "cumflation" "Size difference", "Expansion", "Excessive Cum", "Penis", "Nonpony". Mentioned in passing as part of a bad dream Oak tells Twilight he had, we have "Watersports", "Dark", and "Guro".