Darling no Jouzuna Sodachi-kata

Moved by the innocent eyes of his childhood friend Shuichi, who asks him to be his lover when he grows up, Asahi inadvertently promises him, "When you grow up, it'll be great if you become a high-income, tall, and highly educated person."
And then--the cute little child has successfully achieved the three highs at the age of 20.
He's coming to fulfill that promise!
He shows his love with daily kisses and hugs, and maybe even more...?
When the grown-up Shuichi approaches him with all his masculine charm, Asahi can't resist him, either mentally or physically!?
It wasn't supposed to be like this!
When Asahi can't seem to be honest with himself, what action does Shuichi take--?!