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Invisibility Anonymous
Hentai where characters become invisible.

The invisible Stud (tomei ningen) is one
>> Anonymous
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My balls chapter 15 has a girl who can become invisible
>> KiTA !zx3TGNvBPw
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Moonlit Exhibition has the somewhat rare "Invisible Woman" type.
http://rapidshare.com/files/103836684/MoonlitExhibition._Suehirogari_.English..zip
>> Anonymous
>>858837

That's a good one. Invisible stuff seems to be rare though.