Hello! Do you have any smut where steve or tony are sensitive?

I’m assuming you mean physically sensitive, so here are some suggestions for you:

SENSITIVE SOULS LEAVE COMMENTS AND KUDOS!

Nipped in the Bud by ScarlettsLetters:
Tony keeps secret how sensitive his nipples are. When Steve finds out,
he decides to train Tony to come uncontrollably by nipple stimulation
alone.

Sensitivity by Nefyr: The super-soldier serum made Steve extra sensitive to touch – but
lowered his pain threshold. And by extra sensitive I mean really
sensitive. Skin-to-skin contact = instantly hard sensitive.He’s learned to keep people at a distance so this doesn’t get discovered (and used against him) – but Tony finds out.

Testing a Hypothesis by tsukinofaerii:
The first time Tony noted Steve’s sensitivity was, predictably, one when he was preoccupied.

Kink Meme Fics Chapter 2 by @cptxrogers:
Steve has an extra sensitive prostate
love the sin, love the sinner by @silkspectred:
It keeps happening. Not often, just once or twice a month, but it keeps
happening. Always in the same way: it’s unplanned, sudden, unexpected,
Steve is surprised and eager, his dick goes from zero to one hundred in
two seconds, Tony’s touch is electric, everything he does drives Steve
crazy, but he never lets Steve kiss him, he very rarely looks Steve in
the eye, he never talks, never makes a sound when he comes, never
mentions it later.

wreck me by @starsandstark:
A filled request. Anon wanted Tony to give Steve multiple orgasms by rimming/licking because Steve is so big and sensitive.

Mouth on Trembling Thighs by @nhasablog: “Okay,” Steve said slowly, not looking at him. “I give. Why was it endearing?”Tony grinned into his cup. “Because you’re ticklish? Like, very ticklish. I knew about specific parts on your body from beforehand, of course, but I never could’ve guessed you’d be this sensitive on your inner thighs and-” He waved his hand around Steve’s groin area in a somewhat vulgar manner. “-and there.” “You were down there and you can’t even say the word.”
“That’s mostly for your sake, dear. You’re as red as one can get.” (Or, Tony tries to go down on Steve, but it turns out he’s
way too sensitive on his inner thighs to be able to take it. So they try
again.)

Fingers Walk Your Thigh by @nhasablog:
Steve’s hands keep touching Tony’s sensitive legs way too lightly during their makeout session and it’s very distracting.

Hot Button by @musicalluna:
Tony’s neck is very sensitive.