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Let it be known that Miya Osamu will never EVER open a door without knocking again. Especially if he knows his brother is on the other side of that door.
Osamu knew his brother had a boyfriend, Tsumu even told him. They hadn’t met before but they knew of each other. He didn’t know who the guy was but he knew there was a guy. Osamu doesn’t have a problem with his brother having a boyfriend seeing as how he’s gay and also has a boyfriend. He’s been officially dating Suna for about 3 months now but they had had the phase of dating without the label type thing.
That being said, back to the original thought. He’s never opening a door without knocking ever again. He has learned his lesson and won’t be doing it again, especially if he knows his brother is behind it.
The day before Osamu told Atsumu that he would be spending the weekend at Sunas house. So he guesses he can’t really blame his brother for what happened. Some of Suna's relatives came over unannounced so they left and just went back to Osamu's house thinking it would be quite and they could spend time together there.
There wasn’t another car in the driveway that would suggest that someone else was there so they believed it was just Atsumu. Osamu parked his car and he and Suna went inside. Their plan was to just chill on the couch and watch some crappy scary movies to make fun of.
Osamu told Suna to pick a movie while he went to his room to grab a blanket and a couple of pillows. You may be thinking ‘why didn’t they go to Osamu’s room and watch tv?’ The thing is, his and his brother's rooms are next to each other and while the walls aren’t paper thin, they aren’t very thick either. And the last thing either of them want is to listen to the other have sex. Atsumu tends to stay in his room all day if he’s home so their best bet is to stay in the common room just in case things get heated between him and Suna.
Osamu walked upstairs to his room and on his way there he thought he should tell his brother that he was back. This way he would know to not come down if he didn’t know for sure that they weren’t doing anything. He was trying to be considerate and prevent his brother from having to be scared for life and what does his consideration get him. It gets him a 100 life times worth of trauma that no therapy would ever fix.
He and his brother don’t knock on each other’s doors before coming in, they just barge in. It’s always been that way since they were twins and they had shared a room for 14 years. Just walking in was normal. But this.....walking into this was anything but normally.
Osamu knew his brother was a brat. He was an egotistical whiny bitch that was almost always annoying him. But he was never someone he would consider to be a bottom. There is nothing wrong with that, it’s just not something he associated with his brother. When his brother told him he had a boyfriend, he thought he probably saw some twink and thought he looked good or something. That he was one of those who would get mad at the idea of being a bottom and say stupid shit like, “nah man, that’s gay.”
He very much would have preferred learning otherwise in any other way than how he did.
Osamu opened his brother's door and was met with the sight of his older brother on his knees with his back arched back, and a hand wrapped around his neck while he’s being fucked.
His mind left his body and he was stuck just watching. He couldn’t comprehend what was happening. They hadn’t seen him yet as they were too caught up in each other and he hadn’t opened the door all the way.
His brother's shoulders were then pushed down by the guy he could only guess was his boyfriend. His brother was moaning like a whore and he could get his body to move. He feels like he’s in some horror movie being forced to live through his worst nightmare. His thoughts were broken when he heard the guy speak.
“I didn’t say you could touch yourself baby” The guy said after he heard a smack. The guy then took his brothers hands and put them behind his back.
“Daddy please”, he heard his brother whine. It sounded nothing like his normal day to day whine. No this was much different and he probably will be stuck with it in his head forever. “I want to cum. I need to cum, Omi”
“Not yet Princess, hold on just a little while longer yeah? Be a good girl for daddy okay.” The guy (Omi?) said then started kissing Atsumu’s neck. “You are a good girl aren’t you?”
“Ahh, mhmm yess I’m a good girl daddy, I swear I’m a good gi-ahh fuck” Atsumu let out a high pitched whine. “I’m trying to hold it but I don’t know how much longer I can Omi” The Omi guy then pulled out making his brother whine. The guy then manhandled his brother putting him on his back. “Hi daddy.”
“Hi sweetheart.” He then caressed Atsumu’s face lovingly. “You’re so beautiful, I love you so much Tsumu baby”
“Awe Omi, I love you too. Soooo much. I don’t know how I got so lucky.” Atsumu said as he wrapped his arms around the guy's neck.
“I’m the one who’s lucky. I know the distance is hard, so thank you for sticking around.” He then grabbed Atsumu’s legs and put them around his waist. “Now enough of all this sappy shit. Atsumu’s giggle was cut off by a moan.
Osamu has been standing there for at least 5 minutes. ‘Why am I still standing here?!?” He doesn’t know why. His brain is finally catching up to what the fuck is happening. ‘My brother is a bottom. Miya Atsumu, his older brother, his prick of a brother likes being fucked”. He doesn’t understand why he’s so hung up on this. So what if his brother prefers to receive? As long as he’s happy then everything should be fine right? Logically he knew that but a part of him just can’t believe what’s happening. ‘Had Atsumu been-“. His train of thought was cut off by a loud moan. He looked back into the room and saw they shifted some so now his brothers legs were over the guys shoulders now.
Osamu's body is now cooperating with him and he was finally able to close the door and walk back downstairs to his boyfriend. Suna looked up at him and got worried. “Hey what took so lo- woah what’s wrong?” Suna stood up and walked towards Osamu and touched his forehead. “You feeling okay? Do you need to sit down?” Osamu’s face was pale and looked like he saw a ghost. He nodded his head and walked to the couch to sit down. Suna came and sat down next to him. “Hey what happened? You were gone for a while. I thought you and Tsumu were talking”
At the mention of his twin's name he cringed. “No, not exactly. He... I saw... he and” he kept stuttering because he simply didn’t know what to say. How do you tell your boyfriend that you saw your twin brother having sex with who you presume to be his boyfriend, who you haven’t even met yet.
“You saw him, what?” Suna asked, trying to figure what his twin could possibly be doing that caused Osamu to look like that.
“I- I saw-“ his words were cut off by a loud moan.
“AHHHH FUCK, YES. YESSS OHHH SHIT. YES DADDY YESSSS. “
“YES RIGHT THERE OMI RIGHT THE- OH FUCK”
“CUM INSIDE ME, CUM INSIDE PLEASE OMI!”
“YES, YES I WANT YOU TO CUM INSIDE MY PUSSY DADDY!!”
“YES YES FUC- AHHHH KIYOOMI”
They then heard a deeper voice that was definitely not Atsumu.
“Shit baby you’re so fucking tight”
“I’m coming baby, I’m coming ahh fuck!
Osamu and Suna's eyes were wide open. “That...that’s what I saw...” Osamu whispered. Suna could say anything but a small inaudible “oh...”