It's funny seeing the different ways Kyouma reacts to people that cling to him. With Mira and her involvement with coils he acts cold towards her but no doubt is developing the ability to care about her but is hiding it.
With the Prince, i'm assuming he thought he was human at first, he acts equally as cold but doesn't avoid showing he cares for the child. Giving him new clothes, parting ways with a gift.
He's just a big softy really! A tsunder
His past it still quite mysterious, episode by episode we chip away little bits of it and I want more! Hammer that chisel in and rip out a chunk of that past