Picture Schweiden Adlers locker room after practice and stereotypical locker room talk. One player tells another (doesn't matter who tbh, they just background) that he should be put on a leash. Hoshiumi says something like "yeah, that's true, just wait, I'll bring you one tomorrow". There's some wolf whistles, but there's also our dear autistic Kageyama, who doesn't get it, so he asks Hoshiumi, why does he have a leash at home if he doesn't have a dog. So Hoshiumi tells him "my boyfriend is in vet school, duh" like it's obvious, but apparently noone knew he has a boyfriend at all? So they start grilling him about te mystery boyfriend (spicy details too) after every practice and Hoshiumi (who is very, very proud that he managed to date Sachirou) answers the questions. Fukurou (Sachirou's older brother and Adlers' captain) knows about Sachirou's crush on Hoshiumi, but doesn't know they're dating, and Hoshiumi never says the name of that mystery boyfriend, so Fukurou thinks that Hoshiumi met someone from Sachirou's school on one of their hang-outs, and he's breaking his little brother's heart. Naturally, he starts giving Hoshiumi cold shoulder and nobody knows what's going on (Hoshiumi is worried sick that Fukurou doesn't approve and he ruined brothers' relationship). Until one time Sachirou comes to the Adlers game and Fukurou spots him and asks if he came to cheer on his brother, but Sachirou says he actually came to cheer on Kourai. So Fukurou is all like "Okay, listen Sachirou, about Kourai...", but in the meantime Sachirou spots Hoshiumi and calls for him, and Fukurou thinks to himself "great, now I will have to watch my little brother's heart being broken from the first row". That's what he thinks, but Hoshiumi actually sprints to Sachirou and lifts him up (mind you, he's quite a bit shorter, and may be an athlete, but Sachirou deals with big, heavy animals on a daily basis, so he's got some muscle mass) and Sachirou is laughing and then they kiss! And Fukurou is flabbergasted, he starts berating Hoshiumi for giving Sachirou false hope and also cheating on his boyfriend! And both Sachirou and Hoshiumi are taken aback, because "I'm cheating on my boyfriend... by kissing my boyfriend? Are you okay captain? Maybe you should sit for a moment" - and that's how Fukurou finds out. He also thinks back to all the details he unwillingly learned about his little brother's sex life and gets a "kill me please" look on his face. The rest of the team also starts relentlessly joking and rilling up Hoshiumi by saying that he's dating his captain BABY brother.