#bc Saru's family helped them hook up so now he's all gung ho to hook up his cousin and Saru's big bro

[ridiasfangirlings]

Ok ok but a mermaid AkiHida AU where Siren!Aki causes Sailor!Hidaka's ship to crash into random island because of no particular reason except the ship looked like a pirate ship.

Maybe Akiyama is the oldest of the royal mermaid family – imaginethis as like a counterpoint to the Little Mershimi AU, Akiyama isFushimi’s oldest brother and after Fushimi marries Yata the wholemerfamily settles themselves near the borders of Yata’s kingdom sothey can continue to dote on the youngest grumpy child. Akiyama setsup his space in like this really dangerous rocky pass that bordersthe edges of Yata’s kingdom, it’s a common spot for pirates andinvading armies to use to try and invade the kingdom. Akiyama is ofcourse a very duty-minded merman and considers this extremelyinappropriate, he intends to watch the area very diligently to makesure there are no illegal things going on. Also while Akiyama seemsto be a very even tempered and gentle merman he was actually bornwith like a rare gene that gives him the powers of a siren, he canlure people towards him with the sound of his voice and he tends touse that to trick ships into destroying themselves against the rocks(and he also possibly has a secret habit of checking out the sunkenships afterward and collecting all the chains and shackles that areaboard intended to be used for slaves or prisoners, only his brotherBenzai knows about Akiyama’s habit).

So one day a ship comes through the pass and Akiyama decides that itlooks very suspicious and needs to be investigated. The ship anchorsjust outside of the pass and Akiyama swims closer to try and seewhat’s going on. What he spots is a drunken guy with messy hairleaning on the ship’s railing and singing lewd songs about women’sbreasts, Akiyama decides that this certainly must be a pirate and heis therefore duty bound to destroy the ship. The next day he waits ona rock and as the ship gets closer he starts to sing to try and getit to swerve off course. The ship does end up swerving but then thereseems to be some confusion on board and Akiyama almost gets squishedby the erratic movements of the ship. As he’s trying to get to safetyhe locks eyes with someone on board, the same guy he saw hangingaround the railing the night before, and then a moment later that guygoes crashing into the sea all on his own. Against his betterjudgment Akiyama finds himself swimming down to save the guy,dragging him onto the nearest island. He intends to disappear backunder water after that but maybe he got a little injured in all themess and dragging himself back to the sea is difficult. That’s whenthe guy he saved stirs and suddenly grabs him roughly by the wrist,the guy’s eyes shining as he asks if he’s been saved by a realmermaid. He is highly disappointed a second later when he realizesthat Akiyama is all male and flat chested, Akiyama is like ‘I shouldhave let you drown, shouldn’t I.’

The guy introduces himself as Hidaka and says that he’s a trader, hewas bringing pineapples to Yata’s kingdom to try and sell them.Akiyama is very suspicious because he’s never heard of these…pineapples and besides pineapple begins with a p which is like piratetherefore Hidaka is probably a pirate. Hidaka laughs and tellsAkiyama that he’s a pretty funny mermaid…er, merman. Akiyamacrosses his arms and looks stern as he says that he’s in charge ofprotecting this part of the kingdom and he won’t let any pirates comein, his little brother is one of the Kings here and Akiyama won’t lethim come to harm. Hidaka’s all impressed by Akiyama’s big brotherinstinct, Hidaka has a little brother too and he knows what it’s likehaving to take care of someone like that. They end up bonding a bitover that (imagine Akiyama lovingly talking about what a grumpyasshole his little brother is, Hidaka feels like he should thinkAkiyama’s brother sounds terrible but instead there’s this weird urgeto meet him and become friends with him because the poor kid soundslonely okay). As they’re talking Hidaka notices that Akiyama’sstarting to look a little dried out and offers to help him back tothe ocean. Akiyama’s wary but he’s also having trouble breathingbeing out of the water so long and he allows Hidaka to push him backinto the water. Before Akiyama dives underwater Hidaka asks if thatwas Akiyama’s voice he heard before he fell off the ship, and thatAkiyama’s singing voice is really pretty.

So Akiyama swims off but now he’s all torn, like maybe he’s alwaysbeen self conscious about the siren thing and Hidaka’s the firstperson (besides doting daddy Munakata) to tell him that his voice isbeautiful. He’s discussing it with Benzai when Benzai asks if Akiyamatook Hidaka back to the mainland then, Akiyama’s like 'The mainland?’and Benzai’s like well, you didn’t just leave him alone on a smalluninhabited island in the middle of the ocean without any way off,right. Akiyama’s very displeased with himself for not considering thesituation thoroughly and now he has to decide what to do with Hidaka,like he’s pretty sure Hidaka’s not a pirate but he could beand also if Hidaka goes back to the main kingdom maybe Akiyama won’tever seen him again. He swims back to the island and it turns outthat Hidaka’s still there, having caught fish for something to eatbut he’s getting dehydrated. Akiyama gets some help from his siblingsto get Hidaka some water (Kamo hangs out at an inlet near a bakery alot and they give him a nice water bottle when he asks since he’salways sharing fish recipes with them) and Hidaka ruffles his hairand tells him that he’s a pretty nice guy, isn’t he. In the endAkiyama decides he has to do the proper thing and take Hidaka to themainland, feeling maybe a little crestfallen to see him go (exceptthen the next time Akiyama goes to visit Fushimi it turns out thatHidaka is like a distant cousin of Yata’s who was going to visit theroyal family along with selling his pineapples and they end uptalking more, Hidaka walking out into the shallows of the ocean justto see Akiyama).