I told you once I wanted you, that has not changed.

[ Not that he had ever said why or in what way. That he left up to others imaginations. ]

With me you can learn to control what powers you have, to fan the flames of those powers and soon grown strong enough to rival or surpass even your brother.

[ Rin, not him. None of their brothers seemed to have the potential to rival him.

Though Mephisto did come close. ]

If it weren't you it would be Rin...and I personally find you the more favorable option. You both are proof that demons, even those as notorious as our father, and humans can in fact coexist and even come to love one another. Or as close to the emotion as most demons can feel of course. It's...difficult.