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In the team-drawing episode, Haruna, Akimaru, Mihashi and Sakaeguchi have a conversation in the boys' toilet... but the stench must have been incredible, since Sakaeguchi had just had a bout with diarrhea and not flushed.
When Tajima makes his "forgot to masturbate" statement, his surrounding teammates physically restrain him. Sure it's a shocking thing to say, but there's no need to actually hold him down... unless he was proposing to "take care of things" right there and then.