Multi-fandom x tiny reader

Gray Fullbuster x tiny reader

It was a normal day at the Fairy Tail guild hall. Everyone was having a good time either drinking, hanging out or looking at job requests. Unknown to mostly everyone except Mirajane, Levy and Makarov, (y/n) had just returned from a job and had been hit by a powerful spell that shrunk them down from (original height) to 16 cm tall. Normally (y/n) is an S-class wizard but with their current state Gramps forbid them from going on any jobs until Levy could find a way to reverse the spell. However their current predicament was not enough to stop (y/n).
"Master, one of the S-class jobs is missing from the board." Mirajane stated with a worried tone.
"What! Natsu! Did you take the S-class request again!?!?" Shouted Makarov.
"What no" Natsu replied.
"Well who else would be foolish enough to pull a stunt like this?"
"Well I could sworn I smelled (y/n) in the guild hall a little while ago but I didn't see them are you sure they didn't take the request?" Natsu asked in a defensive tone.
"(Y/n) is in no condition to take on a quest let alone an S-class one." The Master stated.
"Why not they sick or something?" Gray asked.
"They were hit by a powerful spell that made them shrink down, Levy is currently trying to find a way for the spell to be reversed but in the meantime I forbade them from going on any jobs it's too dangerous." The master said.
"Well what job did they take, if we know where they're going we can catch up to them and stop them before they get too far." Natsu states with determination and a smirk.
"The job was to eliminate a dark guild controlling a small village outside of Hargeon. The flyer said that there was at least 20 members of the guild and that other wizards from other guilds had failed to stop them." Mirajane explains in a soft yet worried tone. "Are they Crazy?! That's basically a suicide mission, there's no way they can take on that kind of job!" Gray shouts in panic.
"Don't worry Gramps, Gray and I are gonna find (y/n) and bring them back!" Natsu claims as his fist hits his other palm.
With determination and fire in both their eyes Gray and Natsu go searching for y/n. Lucy decides to stay and help Levy with the spell while the boy's are looking for (y/n). After leaving the guild Natsu uses his sense of smell to track them down. Wandering through the streets of Magnolia Natsu gets distracted by the smell of food and Gray reminds him that (y/n) is probably going to die if they don't stop them. Natsu is now even more worried and follows the scent to the train station. After 30 minutes of searching Magnolia train station Natsu tells Gray that (y/n)'s scent is weak leading them to realize (y/n) didn't take the train and instead left the town on foot. They leave the train station and head out to the forest that surrounds Magnolia.
After about 5 hours of searching through the forest they realize they are halfway to Hargeon and it's past noon. Natsu says that the scent is getting stronger and after 15 more minutes Gray and Natsu finally find them. "There you are! Get them!" Gray shouts getting (y/n)'s attention. Gray and Natsu immediately run to catch (y/n) and dive to grab them and end up slamming their heads into each other. (Y/n) uses this to their advantage and tries to run away ducking under bushes and roots.
"What the hell flame for brains I almost had them why'd you get in my way!"
"You're the one who told me grab them frost face!" "Yeah well I didn't tell you to grab them at the same time I did!"
Gray and Natsu glared at each other with their foreheads pushing against each other growling at each other until they realize they still haven't caught (y/n). They decide to work together having Natsu chase them and lead them into a trap where Gray will be waiting. After 5 minutes of chasing (y/n) Natsu finally manages to lead them right into Gray's waiting hands. "Gotcha! Now stop struggling!" Gray said as he tried to hold onto (y/n). They struggle for a while fighting Gray and Natsu suggests Gray tie them up. Gray then grabs a bit of string and ties their arms above their head and loops the string over one shoulder and back under the other tying (y/n) to his chest.
After they are tied to him Gray and Natsu start scolding (y/n) for their reckless disregard for their own safety. Natsu suggests he and Gray go on the job request but is shot down immediately by Gray as he tells him they need an S-class wizard to go with them if they want to take the job and reminds Natsu that even though (y/n) is technically an S-class wizard, gramps forbade them from going on a job. Gray also states that (y/n) could end up getting hurt if they get into a fight. Natsu relents and gives up. As they head back to the guild they realize it's getting dark and they decide to camp for the night.
After starting a small fire and cooking up some fish Natsu caught, they eat and go to sleep. After making sure Gray and Natsu were both asleep y/n tries to escape again. Heading out into the forest (y/n) continues on their way to Hardeon. In the morning they wake up and realize (y/n) is gone and they go find them again. After reaching Hargeon they find and catch (y/n) again.
"If you try to run off one more time I'm gonna shove you in My pants that way you won't be able to make a run for it again." Gray threatens.
He grabs them as he and Natsu start heading back to Magnolia. After five minutes (y/n) looks up at Gray.
"Gray put me down I have to pee."
"No way I'm not falling for it"
"Seriously Gray I have to pee! Put me down!"
"Alright then go. I'll hold you up while you do it."
"Are you insane you idiot! I'm not gonna pee while you're watching me haven't you ever heard of privacy!" (Y/n) yelled at Gray.
"Fine, I'll put you down and you can go but Natsu will be listening for you so don't even think of running." Gray warned as he set (y/n) down.
"Eww gross, I don't want to listen to them take a piss." Natsu whined.
"Well too bad, that's the only way to make sure (y/n) doesn't make a run for it!" Gray told Natsu.
After going to the bathroom (y/n) pulls their pants back up and peeks over their shoulder. They attempts to run a third time but Gray is faster and was already waiting. He grabs a struggling and kicking (y/n) and ends up subduing them and has had it.
"That's it! You're going in. Now you won't be able to run away and I'll feel it if you try to escape." Gray growls as he unbuttons his pants.
Gray grabs (y/n) and stuffs them in his underwear tucked up under his manhood and balls. After letting go he immediately pulls his pant up and buttons them up sealing (y/n) in his underwear. Gray decides to ride the train back to magnolia as it's faster then walking. Natsu is less then happy to have to ride the train and insists on walking back but Gray reminds him that he needs Natsu's sense of smell to help keep an eye on (y/n).
After boarding the train and picking a seat, the train leaves and starts heading to Magnolia station. Meanwhile y/n is squished under Gray's body and begins squirming. The musky scent is overwhelming coupled with the throbbing of the veins and the vibration of the train. (Y/n) is getting squished and begins trying to find a way out pushing against gray and wiggling. The stimulation from the train's vibrations paired with (y/n)'s squirming starts to affect Gray making him hard.
"Oi! (Y/n), stop squirming you're only making things worse. I warned you not to run off again and you did. This is what you get for not listening." Gray says as he blushes and bites back a groan.
He shifts around so that no one can see his erection which only causes him to get even more aroused. Pressing (y/n) further into him causing them to rub against a particularly sensitive spot. The pressure from Gray and the train's vibration only makes (y/n) struggle harder causing Gray to bite his lip to suppress a groan. He tries to sit still but can't help the occasional grinding. After a few more minutes of constant stimulation and (y/n) being ground into Gray's most sensitive area, Gray finally comes covering the trapped (y/n) is his jizz and making him go into the bathroom to clean his pants and (y/n). After cleaning his pants and letting (y/n) clean themselves off (Y/n) begs Gray not to put them back down his pants and insists they'll listen and behave. Gray doesn't believe them and reaches for them. (Y/n) then sneezes showing that they are getting sick. Gray relents and bundles them up in his shirt and ties a makeshift sling around his chest to keep them close as they falls asleep.
They return to guild where Makarov is waiting and goes to scold (y/n) only for Gray to inform him (y/n) has a fever and is sick. Makarov then decides that (y/n)'s situation is punishment enough and tells Gray to take them home and care for them while they're sick. Gray heads home while Mirajane makes some soup for (y/n) saying that she'll send someone by with it once it's ready.
Gray then takes his clothes off once he's in his apartment and begins to give (y/n) a bath. After bathing with (y/n) resting on his chest while he washes them he dries them off. There is a knock at the door and Gray answers it. Levy and Lucy reveal that they have finally found out how to break the spell and Gray invites them in. While Levy breaks the spell and returns (y/n) to normal, Lucy heats up the soup for (y/n). After they leave Gray then feeds (y/n) he puts the leftovers in his fridge and lays a blanket on them to keep them warm.
In (y/n)'s sick and sleep riddled mind they grab Gray's hand as he walks away and ask him to cuddle with them. Gray complies and snuggles up behind (y/n) with his arms wrapped around (y/n's) waist. 
"I enjoyed being in your underwear. It was nice, warm and soft. Let's do it again tomorrow." (Y/n) says as they fall asleep.
Gray's face is red as he pictures what it felt like having (y/n) struggle against his dick and balls and pictured how good it felt.
"Yeah. Well once you're better I'll make sure to teach you a lesson. You owe me after all the trouble you put me through." Gray whispers smugly with a smirk on his face.