hmmm I'm not sure about this, I didn't like the bit with the phone, I thought it was kinda tacky and it crossed boundaries as it could potentially get her fired, especially if it's something important. Also that thing she said about "you can't say no", uhm actually she can, retracting consent is something that is important especially in a BDSM relationship (which this one seem to be) as the people in them need to have total trust in one another, I would say it's essential. I know this is a work of fiction but sometimes I worry if people who are reading these things get the wrong idea.
First, work-related phone calls at midnight are what black companies do and if it's a recurring event, she'd best change agency.
Next, sure, let's write a dom/sub relationship where the sub keeps on refusing the dom's orders and the dom has to wait the sub to be up to it, or not. This would mean the sub isn't serious about it and the dom is a mop. Either you do it seriously, or it's just pretend.
It's a kind of contract. Ai WANTS to be ordered around, right then and there. Barring some special circumstances, she won't say no and they both know it, but verbalizing it as an order solidifies the contract. I'm pretty sure a "you can't say no" is exactly what she was yearning for.
Yes, consent is important. But here, it's pretty much implied because the one requesting this relationship is Ai. Not Misa imposing it on her. The stalker is Ai here. It's not Misa beating Ai into submission. Your "indignation" is misplaced.