Willing prey is a curious thing. Most creatures will do anything they can to save themselves. Yet there are some that will seek out danger, going where even the most hardened adventurers avoid, just so they can give themselves up willingly. April is one such case, seeking out a giantess in the forest who's more than happy to get a free meal.
That was my original idea, but I changed my mind while I was working. I still like the idea a lot though, and might go back and do an alternate version.
Also, theres a set-in-progress as a follow up to this, where the her little sister confronts the giantess, and is eaten (orally) and digested unwillingly. I hope you like it when it comes out!