I'm sorry but I totally disagree with you. I don't really think that yuzuru and daisuke ate the perfect couple. Truthfully I didn't really see any development it chemistry, it all seemed very forced. And I dint really think takatsukasa and natsuki are gonna be together.
Why not it did seem a little bland in a romantic way but its like slice of life not everything is flower and honey and natsuki is really cute like his uncle and he seems very gentle loving and caring he could be a good match for takatsukasa and they both love baseball so kinda click for me and they could have more love and chemistry that yuzuru and daisuke didnt have
In a realistic slice of life the following things would have happened:
-uke would tell the seme to get the fuck out after he raped him.
-if the guy kept going after him he would have disappeared again.
-The end
It was really good in my opinion yuzuru and daisuke are now a perfect couple and happy now the second couple should be takatsukasa and natsuki