Normal Springs

Alright, another group challenge. Here's the image:



Now then, the challenge: Write a caption about one, or two, or three, or all four of them. Suppose the hot springs you're seeing here are completely normal. No magic rooms, no magic water, no magic doorways or towels or whatever. Also, as usual, suppose each of these four girls was male at some point, and changed by something at least a few minutes before coming to the spa (or whatever the establishment is).

Optimally they will have been changed at different times, and/or by different things, but that's more a recommendation than a requirement for this challenge.

Simple Challenge 3

Just another simple challenge.

Trigonometry

I've got a bit of an unusual challenge today. It arises directly from a detail of the following image:



Seems like a fairly regular picture of a catgirl, right? But look very closely at the bottom-left corner area. The open book, specifically. It's a trig book! There are a couple of triangles, and if you zoom in enough you can even see the laws of cosine and sine written in there.

So, the challenge for this image is to relate your caption's story to that book in some significant way. Captioners, start your keyboards!

Only Temporary

This challenge is fairly simple: Use the following image; suppose the change is temporary, not permanent, and that the character depicted knows this. It's up to you exactly what kind of temporary the change is.