What the hell was with that last story.

dang why would he do that for killing his own foster father.
i know that he doesn't like his father much but why, i would just ran away from him.

I think the son wanted to be held by the father because of love. But the fact is the father love him the way he opposed the wedding but the son broken once when he rebels and get fuck

It's a prelude to this manga http://www.mangago.me/read-manga/kinpeibai_kinden_honoo_no_kuchizuke/

I see