@ Eratas: Laura will have much more maturity and responsibility by far. But Kyuukai will surpass her in both during times of serious need or during times with heavy emotional weight.
So, people will say Laura wears the pants in the relationship, but Kyuukai is the one who takes them off of her at times.
And the romantics will say he's the only one who does/can do it
slowly with relish and perverted desire.