I don't remember the name of the manga, but it is yaoi with toys and bondage. It's between brothers/stepbrother.

The younger one race to the garden and slap the older one in front of the servants because of a mistake he made. Then the younger boy went away and masturbate in a room where the older boy found him. The big bro asked the boy to continue but he said no, I think, or maybe it's that he bite the older brother. Then he got mad and punished him. Then they talked about how their father had do the same thing to the older boy when he was young.

i think it is a oneshot in Anohito to Nitenai Kuchibiru
the 5th one sounds like the right one (Datenshitachi no Yoru)

"you realise that the idea of hope is purely a construct of your mind. Hope is not a tangible object. You cannot have hope. You can only pretend to have it." - you find yourself in a room

yes! thanks! that's what I'm looking for!