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One of the kittens smells like Ruka and has her eyes. Tsuzuki pretends not to notice. He thinks Hisoka knows anyway, but Hisoka never shares his secrets. He loves Hisoka for that.
Tatsumi makes Hisoka happy, so Tsuzuki likes him. Watari makes all kinds of toys to play with, so Tsuzuki likes him too. But it's Hisoka Tsuzuki fights for, Hisoka Tsuzuki kills for, and it's for Hisoka Tsuzuki will kill Muraki one day when Muraki forgets and gets close enough again.
Muraki hurt Hisoka before bringing him to Tsuzuki. Tsuzuki can tell. Nobody hurts Hisoka.
Not even Ruka's kitten.