I've finally done it, a Touhou artwork!
Kanako YASAKA is a goddess who took over the Moriya Shrine and let its original goddess, Suwako MORIYA, stay. This is presumably to keep favor with the original faith-goers. This shrine is home to Sanae KOCHIYA, whose role is similar to a Shrine Maiden (She's not shown in that pic). In fandom, all those people live like a family, with Kanako depicted as a Soccer Mom toward Sanae, while Suwako is somewhat a little sister to Kanako (they're equal, yet, Kanako is the head of the house).
Since Kanako's emblem is a Snake and Suwako's a frog, I decided to depict them like this. While Suwako's changes are barely visible with clothes on, Kanako is now a fully fledged naga.
And it's not everyday that you see a frog and a snake snuggling, hehehehe.
You can check the Nude version of this pic, which revals more details ^^

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It took me quite a lot of time to finish that pic (I spent about 25-30 hours on it I think), but I'm happy with the result. Again I did it without drawing any lineart, so it's rather painting than actual drawing.