[Oh, bless...

He's reminded, fondly, of Aziraphale's inability to grasp sarcasm when they first met, and can't help looking a bit soft as Gwenhwyfar explains.]

We'll keep it between us, then.

[He knows she worries about these things, and if one of her friends ever does turn up, he doesn't want to get her into hot water with them.

He's halfway to lifting a hand to gesture for her to stop when she does of her own volition, saving him the trouble.]

Food's just food, there'll be more of whatever you eat. And of course you can stay, I'm not gonna kick you out 'cause of what you are.

[If he can marry an angel, he can deal with a Nephilim, especially when Gwenhwyfar's world is so different from his.]