That's what I'm going for, some sisterly teasing/ banter. But I wouldn't call Ashley's feeling a crush, she honestly doesn't even know ( or is unaware of) what she's actually feeling for him. Like when you find someone insanely attractive, but haven't pushed any real feelings beyond that. So in her case it would be, he's hot, he saved my mom/family, he's putting aside his issues and opening up his home to us. Those gestures are adding up and they're tugging at her, but all she's ever dealt with are creeps with one thing on the minds, so her heart is processing all this one way and her mind another. It just hasn't clicked for her yet. At least that’s the way I see it in my head.
I just don't want it to be a "you're hot, let me have your babies" type thing. I want them to have a reason to go for it, and for them to be aware of it for the most part.