Oni Dakedo Onnanoko! [I'm an Oni, But A Girl!]
This is the story of a man who meets a cute girl one day, a girl who happened to be an Oni - a Japanese ogre of myth. But she's just a cute little girl when they meet and, thanks to his kindness, she grows attached to him. Years later she grows up into a woman, and the two fall in love and make oni-human babies. Your classic tale of cute Oni-girl romance and great fucking.
I always have to post this one every few years, because it has been one of my favorites since I was technically not supposed to be looking at this kind of stuff. Seung Mina from Soul Caliber gets kidnapped, fucked, and bred by Lizardmen, and in the sequel has to give birth to their foul offspring. Carnal, sexy, and hardcore in many ways that even I am a bit 'eh' about, but I've yet to find a comic that inspires me quite like this one does.
Zoey! Watch Your Ass!
Now I am not sure how many of you played Left4Dead and thought to yourself, "You know what would be sexy? Zombie chicks having a giant zombie-girl gangbang with Zoey." Well, if any of you ever did, here it is. Surprisingly good considering how brutal zombies could be, and Zoey does get knocked up... somehow... My dick isn't questioning it, and neither should any of you!
Igyo no Kimi to [A Tentacled Romance]
And this is a new find that is firmly in the rare genre of Consentacle porn. Girl living alone and thus masturbating furiously to porn alone suddenly encounters a strange tentacle creature. But it turns out to be an amazingly polite thing that simply wants to feast on her bodily fluids and not be a bother. By degrees she and the tentacle-beast basically become roommates, then lovers, and finally she is giving birth to its strange offspring. Very cute and silly, somewhat light on the sex, but overall very adorable.