That’s actually a good question: where are we going with this? Currently there’s not really an acceptable girl outside of the family, and these two are progressing their relationship, but the author does not seem like one to go full “Oreimo”, you know? But there’s the whole “cousins not actually siblings” aspect, and time is moving forward seeing as the crux of the story is his grades and keeping track of each milestone test as it passes. We only have so many tests until school is done! Does that mean we’re gonna have another ending thats, 'MC has a monologue vaguely talking about love, Heroine turns and smiles as a full-page illustration, then MC says some shit like “yeah... maybe it was this way all along” cut to a silhouette’-type shit?