"Snape? Snape would definitely give a child nightmares. And fodder for therapy for life, most likely. But don't tell Lily I said that. He may unnerve me, but she seems to really care for him, so whatever works, I suppose." To be frank, from what Cas knew of Snape, she didn't understand Lily's attraction to him at all, though things seemed to be going well enough for them.
Cas laughed. "Oh god, yes, I want kids. Eventually. Not right now, I mean, I'd like to rebuild my confidence in my ability to brew potions first. And make something of an adult of myself before I try teaching anyone else. But, yeah, in the future. I always liked the ones I knew on ward, and even if we do lose it in the house, I'm sure it'd be resilient enough to find its way back, or at least to food. I'd like to think we'd pass on common sense to this theoretical child, after all."