Ok, this is the back story to my X-Men character. I haven't written any of those yet, so I thought I should explain how the following story follows them.
Leslie "Chord" White is a Mutant. She is an empath that fixes on one person and becomes their personal empath. She is Logan's. She can weaponize the emotions she feels from him. She takes a portion of his emotions and physical pain away to help him cope in the heat of battle and such. At first, she couldn't handle it very well and was useless as a fighter, but now she has advanced and can take his pain relatively well with her own. She was about 17 when she and Rogue first ran into Logan(remember, movie stuff, not comics). Since then, she and Logan have become inseparable. She is more effective when she is closer to him anyway. She is now 21.
This story takes place after The Last Stand. I've gone with the idea that Charles Xavier's consciousness is in that man who had no higher brain functions. He has contacted Logan and Leslie telepathically and revealed all of Logan's past that was covered in X-Men Origins: Wolverine. Life is just flowing on, when a very unforeseen complication arises.