Charlatan

I want to draw on my partner's skin. I want to free hand draw a "tattoo" on her body.

I'm sure how much surface area I will end up covering but let's just assume quite a bit.

Here is my question. Has anyone done this and if so what markers would they recommend.

I don't want the ink to smudge or wash off. Rather it should fade over time.

I've tried a few markers on myself but find they smudge too much.

Any suggestions?