Well, it might be a little too early for Valentine's Day, but this story does take place before that, so why not. Besides, rather early than late.

Mizuki Fuma, after getting a rather strange mission from the bovine moon goddess Coraxol and the elven sun god Opeitos, one that involves her wearing skintight clothes for some reason, finds herself in a peculiar temple from ages past, one where she might have a life changing and world-spinning event. And she will also get banged way harder than ever before, making it very difficult to remember that she is about to be married to another ninja prince.

The story is based on this incredibly fine comic here that features OCs of my good friends, but with a few changes to make it even raunchier:

Mizuki Fuma is from Shattered by Ninja-8004.

Cora and Ope are from Eon by CelestiallySin.