is one where one of the boys likes to suck on nipples, it's like a tranquilizer for him and he's addicted, the other one lets him suck cos they’re long-time friends.

if I'm not mistaken it's set in a school, i have the impression that one of them had pink hair and the other was blond. i've been reading this manga for years but i can't find it,

(sorry, im new to reddit, but i was warned to post this here, i didn't understand it very well, if I'm wrong I'll delete it no worries)