Spoilers :
I really, really like the way the romance progresses slowly but surely. Not only does it allow for some rather cute and touching moments distilled into conversations with our guardian, but it also gives the romance a fruition that will be all the more rewarding for all the time and moments, good and bad, we'll have experienced with our guardian before it comes to fruition.
I'm also very curious to see how the MC will deal with his growing feelings for his guardian. You can see he's trying to deny it at the moment but I'm looking forward to seeing how it develops.
Anyway, all that to say I'm just a fan of this romance pace. Really good job on that.
As for the plot, the captain really rubs me the wrong way. I'd only be half surprised if she became a full-fledged antagonist at some point.