[Kazuya made an odd noise at the "sometimes takes over my body" part, like he had choked on the tea he was drinking, but managed to recover within the split second it occurred. Throughout the rest of William's explanation, he seemed to be staring intently into his tea cup, one hand cupped over his mouth in a gesture of worry]

Really...? Ah. I see. [There was a pause - a long one - until Kazuya lifted his head a long last] I should've known that... since, I...

[...]

I asked, because I have a similar problem, sometimes. [Speaking about himself and his past was something he always struggled with, so his words came out a little slowly and unsure, yet at the same time, he sort of wanted... understanding. Someone else suffered from the same troubles and worries of him, and he just wanted to... he wasn't quite sure, but maybe, extend his hand in response to William's honesty] Ah, though, only in specific circumstances you see. Um. I have...

[He can't say "Bel", since there was no way in hell he was telling William about his current demon issue. Kindred spirit and future husband he may be, but Kazuya had no idea if he'd accidentally let it slip to Kevin, and he didn't want Kevin to hate him. He was a genuinely nice angel, and even if Kazuya was wary of him, it was...well. He just didn't want that relationship to sour. But at the same time, he couldn't say "Abel" - could he? His true story wasn't known... not even Kevin made mention of it]

...how much do you know about the story of Cain and Abel? I mean, really know?