I don't usually like to "sell my wares" (only so many people like my stories) but I did write a MPREG a long, long time ago. It might not be what you are looking for cause there is no slash. I was inspired by Lucy and tried to write it as ridiculous as I could (I think people thought it creepy). In case you're interested, here's the link...
http://www.fanfiction.net/s/3047782/1/G_is_for_Growth
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