Sky High and Dr. Horrible's Sing-Along Blog Crossovers
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Selfishness by Merry Masquerade reviews
All people ever do is use each other. Oneshot. Minor crossover. Some swearing.
Rated: T - English - Angst - Chapters: 1 - Words: 541 - Reviews: 3 - Favs: 5 - Published: 3/22/2009 - Penny, Dr. Horrible/Billy - Complete