Thanks to the commissioner and the translation team. Princess Resurrection has such an unfortunate paucity of good hentai.
That said, I can't imagine sex with a complete and total lack of emotion on the part of one of the participants can be that much fun. Then again, since he's basically fucking a realdoll, perhaps that just Hiro's thing.
As a fan of the original manga I gotta admit, this looks like it was drawn by the actual mangaka. And after searching up the artists' name on doujinshi.org they've only ever done Kaibutsu Oujo doujins. I'm pretty sure this is an artist who fell in love with his own characters to the point of making his own R34. Ergo; this is totally canon.
Base +7, warellis +7, Undefinable_Blue +7, thathornyguy +6
@MadDan : during the manga there are more than a few instances where you meet "copies" of the princess (alternate timelines, mirror dimensions and stuff like that) during the "final" fight hiro goes to gather all these "remnants" so that they can merge with the main body and she can attain her 100% power (IIRC, I read it a long time ago)