Osomatsu-san lemon

Alpha!Karamatsu x Omega!Male!Reader

(Just a thing, this is based of a comic from @Kyosein on Twitter)

It's been a few months since you have now been living with the Matsuno brothers, your parents were on vacation and since they were very close to the Matsuno family, they asked if you could stay with them until they came back. You had some trouble understanding who the Alphas, Betas and Omegas were in the house but it didn't take a lot of time: Osomatsu and Karamatsu being both Alphas, Choromatsu and Jyushimatsu being the Betas and leaving you, Ichimatsu and Todomatsu being all Omegas. You were very close to all the brothers, but you were closer to specific brother, Karamatsu, the annoying and handsome brother, the other brothers were always annoyed by him and were surprised that you would spend more time with him but you just liked him, he always protected you from other Alpha's on the street, took care of you when you were sick, made you smile and laugh, you just adored and gave Karamatsu the attention he wanted but today was different.
You were all alone at home, minding your own business when you started feeling very hot, and sensitive making you trip and almost fall to the ground.

Y/N- grunt* w-what the fuck is happening..?

You couldn't breath, you felt so much heat around like the sun was around you, you were very confused when you remember that it was "that" time of the year, you were in heat.

Y/N- Now..?! R-Right now...!? *whine

You couldn't do anything, neither of the Omegas were home, and you were out of options, not knowing what to do, you decided to go upstairs and hide yourself until it was over, you were going up the stairs when...

Jyushi- Y/N-chan! I'm home!

You were fucked, you rush yourself upstairs and hide in the closet, Jyushi was confused and ran after you.

Jyushi- Eh?! Y/N-chan, where are you going?!

He leaned on the door, ready to open it when you immediately spoke.

Y/N- No! Whine* please...go away Jyushimatsu...

Jyushi- Eh..? Why? What's wrong?

You remember that Jyushi was a beta and he couldn't sence as many scents as you could, you were whining a lot, in pain.

Y/N- I-I'm in heat Jyushi...

Jyushi- Your in heat? Now?

Y/N- Yes...and I don't know what to do but..p-please not let Osomatsu or Karamatsu come i-in..?

Jyushi understood what you felt, and stood outside guarding the door and waited until Todomatsu or Ichimatsu came home but it was even worse.

Oso- Aahh~ Finnaly, Y/N I'm home-

His eyes go wide open with the sweet scent that filled the air, he knew what that sent meant.

Oso- So..sweet...

He started walking upstairs, you heard every single step he took, making you whine more. He tried sliding the door open but he couldn't, only making him get very pissed off.

Oso- Eh..?

Jyushi- G-Go away nissan! Y/N-chan is not himself and neither are you!

Oso- Jyushimatsu...I'm giving you 5 seconds to get away and open this fucking door without being hurt...

Jyushi didn't move a single bit away from the door which only made Osomatsu even more pissed, Osomatsu grabbed the door and forcefully opened it making Jyushi fall.

Oso- GET OUT OF MY WAY!!

He widened his eyes and covered his mouth, smelling even more of your sweet scent, he looked at Jyushi that was in front of the closet door, trying his best to protect you. Osomatsu walked towards Jyushi with a smirk and not in the mood to play.