Nightmare Moon teams up with Chrysalis to stage a coup against Equestria and take it over, but she's in for an unexpected surprise. The changeling queen has to see Nightmare Moon's worth, so rationally the thought of tentacles and penetrating a few orifices entered her mind. Hopefully the fallen princess can handle a few slimy tentacles for Equestrian domination. Or be dominated herself.

A request from my good friend Breath of Plagues who you should totally check out and stuff. Because he's awesome.

Thanks to my awesome editors Selbi, Fourpony and MrPockets for all their help!