One of the seven mysteries of Yumenosaki was hidden in the male bathroom on the second floor, in between of the two last stalls, with all its fame and glory, a glory hole. It wasn't very wide, it had a simple and strange writing of the rules, which was "Put in" on the left stall and "Suck it" on the right.
No one knew who specifically made that thing, some rumors said it was Eichi himself, some say it was a dumb prank of the ex-third years, but actually every actual third year know it was Hiyori's work, before leaving the academy. Maybe not the actual recent hole, but it was his idea and he opened it first. Maybe it wasn't much of a mystery who did it, but it surely was a source of other mysteries surrounding it.
Of course, most of the normal (and sane) students already complained to Eichi to fix that thing, since with its existence's made people only go in two stalls instead of four while going to the bathroom, making it normally have wait line in the lunch pause, but he always denied with a excuse of the student council having too much work to do and never did anything for it, maybe because he, himself was a shameless frequent user. Keito, in other hand, tried to make justice with his own hands, fixing the hole himself, but someone always opened it again, normally in the same day, making him give up after 5 tries.
No one ever admitted anything about it, when asked, most people denied for using or called it gross, but for sure it wasn't inactive. Kaoru was one who always called it "gay" everytime it was mentioned, but god knows how much he used it. Maybe just a bit of less than Tsumugi, because thanks to Eichi, he was exposed by anonymous letters that he frequently normally were the one in the "suck it" side. But that didn't stop him using it, it actually didn't affect him in a bad way, maybe because it surely turned into one of his kinky dreams that he could get off at night.
But that small hole didn't have only sexual adventures; it also had a lot more of other awkward situations surrounding it. One of the examples, it's when the first years met it on their first week and their senpai's didn't even bother explain what it was. Tsukasa and Yuuta we're one of the victims of the sudden cock appearing on their stall when they knocked back confusedly when heard the knockings.
Other famous cause was Leo, when he came back to school, right in the first days, forgetting the hole's actual purpose, got his arm and jacket stuck when trying to reach paper of the other stall. Madara and Kuro needed to help get him out. Izumi scolded him right after, but who knows if he did actually listen to him.
But for the joy for some or the complete opposite for others, everything has an end.
The Glory hole was finally shut the next year, when the second years turned into third years and there was no more perverts to open it again. But the school was forever scarred by the sexual desires and prank thoughts of the older students and everyone who entered that stall with the circle marking on the wood will remember.