Flicking day by day, maybe, since this is meant to be the most interesting thing to happen to Ino and Sakura since they took to training under Tsunade.

Both ideas are good. I think Sakura should be the one to argue since Shikamaru isn't really confrontational, he'd just walk away and not scream about anything at this point. Practicing affection is going to be key for both of them, since Sakura crushed on the most non-effectionate boy ever and Shikamaru didn't think he'd need to know certain moves so soon. 

So do you think dinner > argument > practice is the way to go here for a while?