The "son" that I've lovingly raised for 18 years is now suddenly my "lover"?!

Akane is a handsome high school boy, and Kyouji is a nursery school teacher who refers to himself as Akane's "father." Kyouji has been looking after Akane ever since he was a baby, but on the latter's 18th birthday, Akane gave Kyouji a shocking confession?!

(Source: Gentosha Comics, translated)