My future omega wifu (Alpha!Osomatsu x Omega!Reader)

Our promise

You're 10 years old now while the sextuplets are in the last year of high school. But the brothers notice something on you that's odd. You make excuses to not visit them anymore and you only wear long pieces of clothes who are covering much of your body.

Osomatsu is on the way back home since his brothers doing what they do normally. 'I don't know. What should I do after school? ... Maybe I should ask the others? They must know what to do after school, right? ... Or should I ask (y/n)-chan? She's still innocent and could help somehow. ... Hm?'

Osomatsu looked for a moment over to a playground. But his eyes widen when he sees how three boys from a middle school kicking down at you.

"Ah! No! Give it back!" One of them took the red panda plushe out of your schoolbag Osomatsu gave you. You stand up and reach a hand out. "Ah!" But the second one grabs you by your hair and pulls you back. "Since you can't pay us anymore we destroy this as a payment~." The third one lit the plushe on fire.

Or so he thought.

Before the little flame could even touch the plushe Osomatsu kicks the boy hard in his stomach with his leg. "Arck!" The boy flies a bit away before he crush down on the ground. "Wha-?!"

But when the other two seeing Osomatsu's mad expression they squeak in fear. They let go of you and the plushe. You quickly stumble over to it and hit the ground. Luckily landing with the face in the plushe.

"Run before you never can." Osomatsu growls in a really mad tone. His eyes even turned red. Both of them quickly running away. Osomatsu looks now at you and calms down surprisingly fast. "(Y/n)!"

Osomatsu gets down on his knees and lift you a bit up. Only to turn you around. "Hey, say something!" You whimper and open your eyes slowly. "Oso..." Tears rolling down your face while you reach your hands out to him.

Right now, Osomatsu has the feeling he's a kid again. Not able to protect someone he cares for. " ... I'll bring you to a hospi-" But you suddenly start to cry.

"I'm sorry!" "...Eh?" Osomatsu stares now down at you speechless. "I promised to protect the plushe and you! But this boys were saying bad things about you and even wanted to hurt the plushe you gave me! I'm sorry!"

'She always ... protected me ... in a way. And me? I'm the one who should protect her. I'm older and a alpha. So why ... why was always she the one ... who watched out for me? Who helped me to confront my trauma? ...'

Tears dripping down onto your face. "(Y/n) ... why are you ... apologizing?" You clench on Osomatsu's clothes and cry into his stomach. " ... (y/n) ... I ...!" Osomatsu clench his teeth together and said/yelled: "If you ever get bullied or if you feel sad come to me! From now on I'll be the one who will protect you! Who will make sure no one will ever hurt you again! So please ... stop worrying so much ... about me."

~And then...~
After you two calmed down you showed Osomatsu at home all the dark bruises. Looks like these boys were beating you up a while. Before Osomatsu could leave to kill them you hold him back. So he took care of all the bruises and put bandages on them.

Now you sit in Osomatsu's lap while eating a popsicle with him together and watching a new anime together you love. Even if Osomatsu don't understand why you love these anime.

"Oso?" Osomatsu hums and looks down at you. You look a bit shy up to him. "You said you will protect me, right?" "Yeah, I did." You look now shy at your half eaten popsicle down. "Then ... let us marry each other." Osomatsu hums confused.

"My Tou-san is always saying that he will protect Kaa-san at me, because he loves us. And I love you, Oso. So we can marry, right?" Osomatsu chuckles and pet your head softly. "Sure. Let's marry when you're done with high school, (y/n)-chan." 'She's too young to understand this now anyways. (Y/n)-chan will forget this anyways.'