I heard somewhere that sharks have super sensitive noses, and I immediately thought of rinharu, so here you go!
When Haru first found out about his boyfriend’s little weakness, it was at the movie theater. Rin had wanted to see some American movie, The Fault in Our Stars or something like that. Near the end, Haru’s boyfriend was tearing up, and it was simply too cute to ignore. So he leaned over and planted a small kiss on the tip of Rin’s nose, not expecting the following things to happen.
Rin’s cheeks turned a bright red as he spluttered slightly, burying his head in Haru’s neck, mumbling something along the lines of, “Why’d you have to do that?”
It was if the planets had aligned, after all, Rin knew he was ticklish and used it against him all the time, now Haru had leverage. And oh, was he gonna use it every chance he got.
It was at the dinner table, with cleaned plates in front of them and some boring animal documentary on the TV. Rin was laying with his head on Haru’s lap, talking about how Momo did something ridiculous at practice again. It was the perfect moment, Haru thought to himself, trying to suppress a small smirk at the mere thought of his boyfriend’s reaction. Without further hesitation, he leaned down and pressed his lips on Rin’s nose, watching with growing happiness as red spread across his face. Then Haru did it again, and again, and again before Rin finally shoved his face away and pressed his face into Haru’s stomach.
"Stop before I die, you idiot" his voice was muffled by Haru’s shirt, the heat from his face seeping past the fabric.
Haru let out a small laugh, “This is why I do it, also its revenge for that time you made me cry from laughing”
Rin just pressed his face closer, repeating “idiot” over and over, while Haru just combed through his boyfriends hair with his fingers. Rin never did move from his spot that night, somehow falling asleep in that uncomfortable position, and Haru slept sitting up for fear of waking him by moving. The next morning, the aching in their muscles was too much and they were forced to skip practice.