Seven Colours

Red, Orange, Yellow, Green, Blue, Indigo, and Violet.

If I'm correct, those are the seven colours of the rainbow. I think I can find five of the colours on Nina's body if I look 'deep' enough. 

But where in the world am I going to find yellow and orange on her body?

I really can't think of any part of her body that has those colours, that is, unless I ask her to pee in front of me, which I would surely receive a slap in the face if I really did.

Well, before I even think of pealing her clothes to have a check, I should probably bring her to a mood where she would willingly accept my request, which won't be the easiest to do but isn't impossible at the same time.