the manga's plot wasn't about their relationship.
although i too was expecting to see them develop a cute ass relationship.
(also the mc himself said hes not gay so it'd end in rejection).
He said he's not gay more because he never fell in love with men or even women. Doesn't mean he won't love a man. He obviously knew his friend have a big crush on him and not disliking the attention/affection he gets. Beside there's never a confession so he didn't really reject. I mean, this is BL you should know how it's going to end. But the friend needs to put up a serious game if he wants Natsumi in the future since vege-kun is still happy being fudanshi at an all boys-school.
Ok so don't know what to think. Wow it's twisted but good at least the characters had a good ending but I wish they explained more of the main character and his childhood friend. It was a good manga despite the intense developments