I just came across this forum and thread from Ricobanderas' site. Got a lot of cool stuff from here. I really liked the Doujinshis by Hiro and Inoino.
Does anyone know if the "Inda No Himekishi Janne" Doujinshi has been or is ever going to be translated into English? The "Magical Fencers Silky Star" and "Yumeka Genka Maboroshika" ones both were translated by somebody, so apparently there's a good samaritan(s) out there who's familiar with those authors.
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Anyway, I thought I'd post some stuff of my own.
I think the japanese site "Kiss in the Dark" was mentioned early in the thread. There are 2 sister sites, "Macxe's" and "Escalation2XXX" that deal mainly with heroines being taken over by skintight black latex and turned into sex fiends (if anyone's ever read "The Sinful Parasite" by latex slut on asstr.org, same thing. If you haven't, do, it's very good).
I.E. they did a short 3-page Sailor Moon doujinshi/webcomic of a black-latex-suited Mars converting Mercury.
http://mcxes-seres.kir.jp/macxes/img...comic01_01.jpg
http://mcxes-seres.kir.jp/macxes/img...comic01_02.jpg
http://mcxes-seres.kir.jp/macxes/img...omic_01_03.jpg
Escalation2XXX is more of a blog; it had a pretty good serial story about some sort of global defense organization (of the Sentai variety) being taken over from within with all the female personnel getting turned into latex fiends, then showing up for work wearing their normal uniforms over their new latex suits (apparently the unconverted personnel were too dumb to notice everyone suddenly wearing black gloves and thigh-boots

). It's buried in the archives, I think the story starts at the site's first posts.
http://blog.livedoor.jp/li_q_bondage/
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Here's a japanese imageboard where artists post MC/conversion related fanart. Hiro and Crooked Navel seem to post their stuff here. Scroll down to the bottom of the page and click on the white box with "10" in it to view the next page.
http://haruka.saiin.net/~historicalworks/cgi-bin/MCbbs/imgboard.cgi?page=1&p1=&p2=&amode=
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Something from a mainstream work; This is from the new Castlevania game for the PSP, Dracula X Chronicles. Apparently, if you don't perform certain mission objectives, the hero's girlfriend gets turned into Dracula's evil succubus.
Here's the cutscenes on youtube, one for each of 2 player characters:
I also found this fan-made morphing GIF on a Castlevania forum. It's the girlfriend changing from a maiden into a succubus.
http://i271.photobucket.com/albums/j...us_Annette.gif