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When Tony walked into Peter's room he thought he would be seeing his usual happy cheery kid bouncing off the walls and ready to ramble his ear off , but instead found he him laying on his bed face down and moping.
"You alright kiddo?"
"I'm fine Mister Stark it was just a long day."
"You sure?, you look like someone got your underoos in a twist."
"You're not funny"
"Excuse you I'm hilarious" but Peter only rolled his eyes and went back to faceplant in his bed.
Tony decided he needed cheering up asap and the best way to do it is by laughter. And when Peter doesn't find his jokes funny, well then he has to resort to other means.
Tony sat down at the end of the bed and grabbed one of Peters feet and trapped it between his legs.
"Tony what are you doing?"
"Cheering you up of course!" And with that he started tickling up and down Peter's foot.
Peter instantly started laughing and trying to free his foot, but found himself to be firmly trapped.
"Nohoh pleahehese" he squirmed back and forth, fists pounding on the bed which did nothing to lessen the ticklish feeling on his foot. And to his horror Tony decided to take of his sock, making the tickles feel even more intense.
"There is that smile I missed. Doesn't this feel better instead of being all mopey?"
"Nohoh!" Peter protested
"No? Well I better up my game then. Lets see how sensitive those toes are." he teased
Tony tickled both under and in between his toes, making Peter howl with laughter.
After a while he slowed down a bit, only lazily wiggling his fingers up and down Peters sole, occasionally tickling the sides of his foot making him shiver whine, as he giggled himself silly.
"Are you cheered up or do you want me to get your other foot to?" Tony asked knowing perfectly well that Peter was enjoying this, because like always he did not ask Tony to stop.
Peter blushes furiously but shyly replied "the other one to" trying to look anywhere but at Tony the whole time.
Tony of course obliged and switched to the other foot and giving it the same treatment, but this time Peter laughed harder then before.
Tony let out a chuckle "I guess this foot is more sensitive than the other?" he inquired, looking at Peter who hid his face in his hands and only nodded.
This went on for another few minutes until Peter was all tickled out and smiling.
"Thanks Tony." he said timidly
"No problem kiddo."