Gaster AU x Reader ONESHOTS

Trainertale Gaster x Flying Type Master! Reader

(I'm gonna make Gaster as Sans's older brother.)

You and your Charizard were relaxing in a meadow you found, Charizard was sleeping as you sat with your back against his head, you were also petting his snout gently in slow circles. "This is a great day to skip training, huh?" Charizard purred in agreement until... You both heard angry fish noises. "At least it lasted longer than yesterday..." You grumbled, Charizard growled in agreement. "(Y/n)! Will you stop skipping training?!" Undyne asked as she jumped over a bush, you sighed as Charizard rolled his eyes. "You are the future champion! You must stop being so lazy, punk!"

You stood up as Charizard lifted his head and turned it towards Undyne. "Sorry Fish Lady but, I gotta go. Gaster promised he'd help me tame a Honchkrow." You lied before hopping onto Charizard's neck and took flight, you both stopped when you were in an area clear of trees. You stood up and got out another pokeball. "Ready boy?" Charizard barked it's name before you returned him into his pokeball, you started to fall as Gaster walked by. "Wooohooo! Gooo Hootdini!" Your newest flying type came out and zoomed towards you, it grabbed both your wrists with it's talons.

You squealed until you saw Gaster. "GASTER! LOOK OOOOUT!" You both crashed into each other and rolled as Hootdini accidentally dropped you. You and Gaster stopped rolling to be in an awkward position. Gaster was on top of you as you were underneath him. "Uhh... hi..?" You said nervously, a deep blush was growing. Gaster didn't say anything as Hootdini got up and shook itself off. Gaster got up and brushed himself off before helping you up. "Sorry I crashed into you G! We're still working on our entrance." You apologized as Hootdini walked and hid behind you. "It's fine."

You both stared at each other until Hootdini nudged you towards him. You blush was deep crimson as Gaster's was a deep purple. "Y-you're not helping Hootdini!" You squeaked at Hootdini before Gaster turned you towards him. "Hootdini is kinda helping something..." Gaster said, you felt his hand moving to your cheek. "G..Gaster?" Gaster lean in, so did you. Hootdini covered it's head with it's wings, leaving a little gap to see you both. "I.. I love you (y/n)..." "I love you too Gaster..." You both closed the gap as Undyne and Sans walked by.

"YEAH! GO BRO!"

You both quickly pulled away and blushed deeply as Undyne and Sans laughed their heads off. You huffed and snapped your fingers, Hootdini nodded and used razor leaf on the two until they ran away. Gaster looked at you and smiled as you snickered. "Brothers, what can you do with them?" "Razor leaf them." Gaster chuckled before he kissed your forehead, you smiled as Hootdini returned to his pokeball.