This one's a little fucked up and I don't know why it came to my head.  I might turn this into an actual book or a series .
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Relationship - Shuichi x Mistress! Reader | Smut
Warnings - Angst , Nsfw , Cheating .
Words - 1251

[ I also wrote this while listening to Alina Baraz - Unfold, unironically the slow version, so I got into the mood while writing the flashback scene . ]

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You ' smiled ' watching Kaede kiss Shuichi on the cheek, Shuichi didn't seem to be so fazed by it.  In fact, he seemed a little bothered by it.

She was going to be away for a while on some trip and had asked for you to make sure that he would be taking care of himself.

' Oh I'll take care of him . . ' You think annoyingly.  She turns away from him and to you.

" I'll be back soon . " She says as she rolled her suitcase to her and began leaving.  You leaned onto the wall of the small hallway while Shuichi was by the door.  The door was heard closing.

You had always envied Kaede, after all she was very popular among your high school year and she had, in some  way, taken Shuichi away from you.

When they got married he had only done it to please his uncle.  For this was the reason you also never told him about your feelings.  Though that had changed.

You sighed and looked down at the ground.  Your hands folded as you still leaned to the wall, your hair was covering the side of your face in which Shuichi wouldn't be able to see you.

Only your eyes were visible to him.  You pushed yourself up and headed into the , now in use , spare bedroom.

Shuichi watched you go inside, he knew why.  He hears the door closing, he blinked before he would go to his own room.  He sat on his desk and sighs in frustration.  He knew you loved him.  How couldn't he?  He had been having sex with you behind his wife's back some time after they'd gotten married.  He had ended things after 6 months and the topic was forgotten about. 

- -

You were sitting on your bed, your big window had allowed in the sight of the florescent yellow sky that would be followed by a pink and eventually into a purple.  Your white thin curtains were tied to each side of the window sill to avoid them covering the sight before you.

A peach tint fills the room, soft music playing in the background.  A soft sad smile presentable.  Your fingers tapped against your hand to the beat of the music.  You thank yourself for not putting in the headboard of the bed, it would be a struggle to look outside if you had.

The after party would be located in the same villa were you had all lived.  You couldn't bare stand foot in that place any longer.  Watching the man you love be happy with another.

You heard the door handle twist, the door opens and the silhouette of the person standing at the door is seen.

" Y/n ?  Why aren't you downstairs ? " The voice from the one behind you calls.

You turn around, smiling.  " I'm a little tired I guess . . " You lie, but he caught onto your it.

You stare him up and down, he was still wearing his suit.  He looked absolutely handsome.  He wasn't wearing his iconic hat.  You wish he was wearing that for you.

He looked back at you.  The way the lace dress hugs the upper half of your body.  It was a bit see through, something he had taken note of.  The long knee leveled fabric was flowing behind.

" Is something wrong ? " He says as he walks closer to your bed. 

' You just married someone who isn't me ,  yes something is fucking wrong . ' You answer in your head.

" Uhm . . Maybe . . ? " You answer not thinking.  One of his eyebrows raise up.

" ' Maybe ' ? " He questions.  You push a strand of hair behind your ear.

" I don't know . . " You said while looking down at your messy bedsheets that were a tint of orange from the sunlight being brought into the room by the sky.

" Shuichi . . ?  If I tell you this . . Promise me you won't see me any different . "

Shuichi was confused with the change of tone in your voice. 

" Okay ,  I promise I won't . " He says sitting on the bed.  You turn away from the window and turn to look at him, adjusting yourself into a sitting position.

" I wish I would have been able to tell you this earlier . " You begin, " Shuichi . . ever since we met as younger kids I always had an eye for you .  Out of everyone in school ,  you were the only one to catch my attention .  I saw you for what you had inside ,  while other's judged who you were on the outside .  I always wanted to tell you that the love I felt inside began to grow , but I couldn't . "

" Then as freshmen in High School when you met Kaede ,  you started to stray away from me and I was left behind .  I saw no hope in you loving me back .  But I still wanted to stay just for you .  Even if it meant another woman taking away that happiness from me ,  at least I would still see that spark of hope in you. " You hugged your knees closing your eyes. " Shuichi Saihara . . "

Shuichi's eyes were slightly widen, yet they still held remorse, concern, regret, and compassion.

" I love you ,  even if you don't belong to me .  Even if your happiness pertains to someone else .  Even if you weren't meant to be with me . " You say bringing your head low. 

His heart breaks.  Now that he knew, he wish he could take back this day. 

" Y/n . . " He says, but you don't listen. 

He then brings his hand under your chin, he brings your face up.  Your tear filled eyes meet with his tear filled ones. 

An instinctive feeling knocked him, he needed to say something.  He was going to.

" Y/n . .  I love you too . . " He says.  Your eyes widen with the tears that still rolled down your cheek. 

" N - No Shuichi ,  I mean it romantically .  Not platonically . " You empathize.

Shuichi nervously takes a grasp to your hand.

" I love you . "

The same feeling that had knocked into him came to you as well.  You throw yourself at him, he stumbled back a little.  He hears you soft crying.

But he hugs you back, your arms wrap tighter around him.  Not wanting him to leave.

He gets your message.  Completely forgetting about everything else, and everyone.

You pull away from him and look into his light grayish green eyes.  He looks into yours. 

Not thinking, he slams his lips onto your soft pink ones.  Your eyes closed as his kiss showed need, want, and love.  Now under your own will, you were kissing him back.  Your hands were tugging at his suit, his hands were cupping your face.

Over the course of the many years you've known each other, you never expected for him to do something like this. 

You push him back onto the matress, " Fuck ,  Shuichi I can't take this anymore .  I love you so damn much . " You desperately say.

You reconnect your lips with his.

-

The memories swarmed into his mind.  The memories of that intimate night.  He looked out the smalle window in front of him.  The pink sky was illuminating a pink and purple hue into his room. 

He sighed and closed his eyes while leaning back against the computer chair

You were sitting on the carpeted floor, you were watching TV while it's blue light made your figure visible in the room.  You weren't paying much attention to the TV though, your mind was set on someone in particular.  You sighed and closed your eyes.  Burying your face into your knees.