This will be a much shorter one-shot as I'm getting tired but I wanted to write another one shot besides Mikoto (currently also working on a Yata x reader oneshot)
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(Y/n)'s Pov-

Sitting on the floor of the Jungle base I stared at the screen in front of me as I played my game, I groaned as I died yet again,
   "Damn it! I just can't win one game can I!?"
I gently threw the controller beside me and slammed onto the floor onto my back glaring at the ceiling as the plane glided around on it's track,
   "Geeze (Y/n) calm down, I know a game you can win"
I looked up, seeing none other than Sukuna leaning over me, a smirk plastered on his face as he looked down at me, my (h/l) (h/c) hair spread on the floor under my head,
   "Really, do you now?"
he smirked and sat down beside me, humming and quite interested I sat myself up then turned to face him and tilted my head,
   "So, what's the game?"
he grinned childishly as he stuck his tongue out at me,
   "Thumb war obviously"
I looked at him sweat dropping before giggling slightly,
  "Okay you're on, are there any conditions?"
he stopped for a minute and looked me over before closing his eyes thinking to himself with his fingers under his chin, dang he was cute. He opened his beautiful eyes and then looked at me, smirking and his eyes shining with confidence,
   "Yhea! So, my condition is, if I win three rounds I get a prize of my choice from you, if you win three rounds I'll do whatever you want for today and tonight"
My (e/c) eyes instantly lit up and gained a flame of desire to them, I was going to win this no matter what it took, I smirked as I looked him in the eyes,
   "You're gonna loose Sukuna so get ready"
Sukuna noticed the spark in my eyes and grinned as he held out his hand,
   "We'll just see about that now won't we?"
I nodded grinning as I took his hand and we began our rounds of thumb war

~Sukuna: 2 Points ~(Y/n) 2 Points~

I felt my eye twitching as we engaged in our last round of thumb war, just as I was about to pin Sukuna's thumb down he pulled me over to him, using the hand that was in a thumb war and kissed me on the lips, my eyes widened before I closed them and softly I kissed back, before I knew it my thumb was pinned down and Sukuna pulled back, a smirk on his lips as he winked at me,
   "Not only did I win, but I also got to kiss you, two wins in one~ Oh make that three as you now owe me one prize of my choosing~"
my face was on fire by this point, even the tips of my ears had gone red as I sputtered out, embarrassed and somewhat confused, 
   "W-What do you want S-Sukuna?"
He smiled and brought a hand up to my cheek,
   "How about being my girlfriend?"
I quickly nodded, my lips curving into a giant grin,
   "Of course!"
he grinned himself and pulled me onto him so quickly he fell backwards onto the floor and I was now sprawled onto of him, we smiled laughing before hugging and just laying like that for a while, eventually we ended up falling asleep.

~Bonus~

Yukari walked into the base and chuckled seeing Sukuna and (Y/n) sprawled on the floor together,
   "It finally happened, congrats you two"
he smiled and then went to the couch to get some 'beauty rest' not that the beautiful bastard needed any more.