Maybe it was guilt, yes, it could only be that when he brought you to his own house, the daughter of one of his enemies, a new adult without any well-developed ninja knowledge. His obligation on the mission was to eliminate your clan and he did, well... except for you, you looked too much like a childhood friend of his, a very close friend: Obito Uchiha.

The same hair and eyes, he couldn't deny the resemblance, it was almost painful, that's when he brought you, you were hurt and he couldn't force himself to finish the mission. He didn't know what that feeling was. He knew that he would protect you, that he would take care of you, that he would hide you from all the evil of that world full of wars and evil.

That whole shinobi life was hard enough, tiring and full of losses, he was completely tired of losing. You were like a breath of fresh air, you were the one he would return to after each tiring day of fighting and teaching his students for an inevitable future.

His fingers played with your hair, while you lay with your head on his lap, Kakashi reread that book that book of dubious contents for the ninth time it seemed, he was so entertained, simply comfortable. He had just changed all the bandages on your body, caring for you with affection, as if somehow this affection directed at you made up for all the suffering of your past.

He knew he would be punished if anyone found you, after all, he shouldn't have spared you, you were an enemy, a villain, but there he was, embracing every risk eagerly. Willing to suffer for you. Willing to do anything for you.