Why did I go into Logan's tent that night? Well, there are two reasons, really.
The first is that I'm a red-blooded woman, and Logan is one hell of a man. Why pass up the chance of a little contact time with him, even if I had to wear Jean Grey's body to do it?
It was never going to work for long - he would have realised I smelled wrong eventually - so I left the scars for him to find.
See, I wanted to show him how easily I can play with his mind - whenever. I. want.