"I don't love 'Sasha never leaves the house alone' as a solution and I'm already with you two most of the time." 

"I think this sort of thing is why you can take away my ability to speak."

"...the thing where sometimes you make suggestions I have disagreements with?" 

"No, so I can be a guard without you having to talk to somebody and interact with them like they're a person."

"You'd be a person whether I was treating you like one or not. Not letting you speak would make you miserable and wouldn't help me." 

"You're not actually in more danger than any other human-- you're probably in less danger-- it's just that humans in general are in a lot of danger and they have no idea."

"...that's another thing I don't love but there isn't really anything we can do about it, unless we decide to hunt down every vampire in Berkeley and dump Lilith in the Marianas Trench where she can't form grudges with anyone." 

"If we found you a holy symbol, that'd be good against demons and vamps. Witches can't do anything without a lot of effort. The fae are fine as long as you don't break any laws, and for obvious reasons I'd rather not have you carry cold iron. Weres are vulnerable to silver, so that's easy, and that also gets vamps. There's a bunch of stuff that's just-- super-strong and occasionally prone to attacking people, I don't know what you can do about that, except maybe taking up track."

"...I break human laws literally just by being here, my parents aren't legal immigrants. And I highly doubt it's a fairy law that you have to give people your candy for lunch if they hint that they want it." 

"I can find you something silver." 

"Fairy law, not human law. And changelings are weird, they have the fairy need for law but don't know our laws, so they imprint on random things. Human law, a religion, reciprocity, promises, tidiness..."

"Or incomprehensible social drama that anyone could get dragged into at any time, but my feelings about Lilith aren't really the point. I assume I'm unlikely to break fairy law?" 

"If you ever talk to a fairy without me around, be very polite, don't eat or drink anything, don't give them your name, and don't say thank you, and you probably won't die."

"So basically everything the folklore says. — I want to say thank you but also I don't want to say thank you." 

"I'm your property, you don't have to be polite to me."

"I want to be polite to you!" 

"Then you shouldn't say 'thank you,' I guess."

"Okay. — in human culture it's rude not to say thank you, which is why I've been doing it. I will try to remember not to use it with you but might slip up on that." 

"It's all right. You can do whatever you want to me." He says it like he's remarking on the weather.

"...I want to do right by you, which means treating you like a person and being polite and not hurting you if I can avoid it." 

"I think doing right by me means letting me try to make you happy, since that's what I was made to do, and not anything about thanking me or not."

"...okay." 

How about he cuddles both Leo and Marlo some more. 

Leo approves of this plan. He has one useful skill and he is going to use it.

Leo has many useful skills, such as causing Sasha to be able to get his homework done and knowing anything about magic and creating portals to alternate dimensions. But this one is particularly useful right now, yes. 

They can cuddle as long as Sasha wants!