Take a dip with the Shadow Leviathan! As a horny mage, you summon a wide variety of creatures, though the reasons are hardly tame. These alien—yet intelligent and willing—creatures have strange and unique physiologies, normally incompatible with a human's.
Today you've arranged to meet with a Shadow Leviathan, a whale-sized cross between a shark and a shrimp from planet 4546B.
Supplemental character card here: https://rentry.co/drainpipe