The only one I've ever read was the unfinished (possible discontinued?) Side Effects by ChibiRisu-chan. I know this fic is also posted here on LJ, but I only have the link for the FF.net version.
BTW, you wouldn't happen to have a link to Tangled Reeds, do you? I've been wanting to read more KakaIru mpreg, but haven't found any good ones.