What's going on? The artist for the Re:Zero manga seems to be drawing a NSFW Rem doujinshi?

Somebody explain what's happening http://ift.tt/28RFddI

[Fanart] Rem by RAN (Re:Zero)

AmazingArtist has 3 more Re:Zero pieces on his website, some are spoilery http://ift.tt/293CLiQ

[KonoSuba] YAMEROOO remix

https://www.youtube.com/watch?v=P49FraVNS_Y http://ift.tt/1OhzPdE

[Fanart][F/Z Spoilers] Rider & Waver

"He ordered me to live"source http://ift.tt/1OAxsXx