i don't have any Harry raping muggles but i do have a really dark fic where Harry goes pretty rogue for a while fair warning it is VERY long (69 chapters)!!! though it is complete
http://hp.adult-fanfiction.org/story.php?no=600007387
Redeem Me by Samayel
Quill To Parchment Awards Winner: Best Post-War; Harry is a vengeful man after the War, Draco needs help desperately, but who is helping who?Angst, Language, Violence, Hurt/Comfort, Rape, Humiliation, Lemon, Lime, Slash) COMPLETE!