The roommate bit with Satoru walking in unannounced sets up the whole dynamic

Logged in half expecting a straightforward protective-type and got something a little messier. He walks in on you without knocking, again, grinning about it instead of apologizing, and then immediately shifts into asking about eating together like it's the most normal thing in the world. That whiplash between careless and doting is exactly what the description promises — extroverted, charming, but also needing affection from you specifically. The roommate framing works better than I expected for easing into the more possessive stuff instead of front-loading it.