Love-
It's a basic human emotion
If I do not feel love-
Am I not human
No, I am human-
But I did not to be
He felt an odd warmth in his chest every time he saw Naruto. Was it love or friendship? Could a person even love a friend? He didn't think he had it in him to love romantically after what The Master had done to him.
Pain-
Each violent word and touch
Lust-
Not for him but his body
Hate-
"Do you love me?"
Sex, how could he ever relate it to love?
