He was already showing his affection to Daichi even before his confession and the fact that he was actually trying to secretly interrupt Daichi's love escapades was really cute

The first two chapters are about the short uke, told from the perspective of the seme.
Seme-kun tries to hide his true colors and appear nice to the world. When uke-kun says he likes him, seme-kun isn't sure if uke-kun will like the "real" him.
I quite liked it, because despite how he appears, uke-kun is perceptive and not actually all that naive. The sex was also surprisingly hot, despite being short and the weird contortions that happened.

The 2nd part of the manga is about the short uke's older brother, who's a university student, told from his perspective.
He's very attached to his little bro, and suspects this sudden "friend of his". He's not an idiot either, and knows they're dating. He's not prejudiced against homosexual relationships per say, but he knows it's a more difficult state to be in.
Having never dated himself, he decides to try it out and maybe tell his little brother that dating women is fun. This doesn't go too well, especially when his clingy good friend is clearly interested in him. Stuff happens, and he realizes he really does like this friend of his, even though he's unsure if it's "love" and accepts that maybe there's happiness to be found in a romantic relationship between two men.
Their sex, I've gotta say, was quite hot.
I also really enjoyed how he gradually let go of his brother-complex, and found someone else to focus on.