What did Akihiko exactly do to Haruki? (Blowjob? Or Rim job)

I mean that scene when they fight and for some reason aki goes down on him like Haruki says in the manga, does he suck his dicc? Or does he like eat him out cause looks alot like he did that-- poor Haruki either way, must be super uncomfy if he does eat him out cause his ass hole was probably dirty since he wasn't prepared, or like what if he had to fart 0-0