Indeed they are illustrations for existing stories. Not all of them but most are.
Namely, Hikari's Diary (Hikari and her sisters, some Asuka and the preggers pic about Hikari, Asuka and Yui), Back Seat (Hikari, Asuka and Fuyutsuki), MODEL (mostly Asuka but Hikari and her dog are also featured from here), Innocent Taboo (primarily Asuka, with some Rei, Musashi and Keita on the side), My Secret Experience (the two chickan pictures about Asuka/Touji and Rei/Shinji), Stray Cat (adult Asuka, with Ritsuko and Gendo).
The two relationship charts he made are for Hikari's Diary and MODEL. I translated the former into English but I'm not sure whether it's okay for me to post a link here. The chart itself isn't NSFW but Sankaku Complex is.
Of these, I've only read Hikari's Diary and Innocent Taboo yet. The latter is what I'm translating and since my last post, I've finished the raw of the first chapter. It's not 100% accurate and some lines are not translated yet but it's almost ready. As for Hikari's Diary... it's about, you guessed it, Hikari and her sisters. Namely, Horaki papa is using his daughters to sate his sexual desires. Yes, all three of them. Kodama was the first who slept with him, followed by Hikari and even though Hikari went into it to keep him away from Nozomi, he scored with Nozomi anyway.
In the story's extended edition, Yui divorced from Gendo and married Horaki papa, bringing Shinji into the family. Too bad Horaki papa's a sexual monster and turned her into a masochist, followed by Hikari helping him score with Asuka as well. The chart can explain more but in a nutshell, by the time the chart is made, Nozomi is the only female in the family who hasn't been pregnant at least once. Even better? Yui's second pregnancy (technically third, if we count Shinji) is from her son! And Asuka's second kid is also from Shinji! Who is currently taking care of Asuka's first kid because Asuka became pregnant again within a year of giving birth!
Last edited by amitakartok
on Thu Mar 05, 2015 12:02 pm, edited 3 times in total.
Strategic Cyborg Evangelion : an average author's aspiring attempt at awesomeness. Currently at chapter 42.
Mana, Mayumi and Sakura: the TRUE goddesses of Eva