1st - Is from a manga called - Amaenaideyo!! Ms, and is on Chapter 14
2nd - Is from a hentai manga called - Shoujo Dorei - a slave girl
3rd - Is a Queen's Blade doujinshi - google '(C76) [Hellabunna (Iruma Kamiri)] QB (Queen's Blade) [English]' to find it
4th - Is from the same hentai manga as the second picture - Shoujo Dorei - a slave girl

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Sugoroku Naked Append Patch from Whitecube

It is available now for just 76 cents US, 86 JPY. If you have purchased the game that is.

http://www.dlsite.com/ecchi-eng/work.../RE204695.html

Oh I forgot there is this game I also got, really good when it comes to enf and humiliation too.

Civilian Justice League 2 from Clymenia

http://www.dlsite.com/ecchi-eng/work.../RE201363.html

Are you sure the 4th is from the same one as the second? Didn't see the page?

the best comic "17 Couple Game"
 

Woops sorry, your right. the 4th image is actually from 'Dorei Ichiba by Asaki Takayuki'

らぶゆ manga
 

Interesting and Helpful Sites
 

http://syounenh.seesaa.net This website has some info about manga from the 80's and 90's that contain ENF and EUF.

And this website https://ascii2d.net is a helpful image search.

”この島には淫らで邪悪なモノが棲む“
 

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A small tease from Guglielmo. I didn't expect the sequel to be released after two years.

New Sources Found
 

I found a new source so send me a PM and I'll give you a link to this new source.