Lavi, being a bookman knows a lot of different things.
The difference from yes and no.
The difference of what is his and what was his.
The difference of realities from his dreams
And who his body belongs to is different from who his heart belongs
That the feeling of friendship is different from the feeling of true love
He knows the difference of who he is with and who he does love.
It is different when you know what have your mind followed rather than your heart
There is a difference of whose hand he is holding to what his eye is following.
He knows what is the difference of Lenalee who he is together with, from Allen who he is inlove with.
Of course, there is a difference of Kanda, the one holding Allen's hand tightly, from him, who can just watch from far away.
Of course, he knows these things... He already accepted it a long time ago...
...It's just that
"You're mine, Moyashi"
"Of course, BaKanda"
Whenever he is reminded of the difference of what belongs to him and what didn't...
Another part of his heart is breaking again...