Finding a yaoi manga with this scenario.

There 4 charcters in the manga. Here's what happened to the two secondary characters. On the special chapter. The seme's rival, who is the childhood friend of the uke and he came to befriend in the end talks about how erotic the uke is when he eats. Then the uke overhears it and ask the seme if that time in the festival where he ate chocolate banana, he used it as a fap material. And the seme didn't deny it blushing. It is then that the uke smiled brightly.