You got clicking around on AO3 or maybe tumblr, and now you're scarred for life. You're also asking, "What is mpreg?" The short answer--and the long answer--are here.
What Is Mpreg?
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A Brief History of Mpreg
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It's easy to think of mpreg as a kind of modern invention, related to scientific advance and scifi writers. As it turns out, it's probably a lot older.
Coming January 28! Get set for more intergalactic hijinks when a monk inherits a HOST CLUB ON THE PLEASURE PLANET!