I'm searching for two fairly short fics.
The first one was always-a-woman!Tony/Steve, told from Clint's POV I think, and I definitely read it on AO3. The gist of it is, Tony's been acting weird and Clint is observing her in her workshop, and he comes up with the basic conclusion of "I dunno, she seems fine except she hasn't had any coffee at all today and she strapped speakers to her torso for no apparent reason." Turns out, she's pregnant and hasn't told anyone yet. Steve goes a little crazy throwing the coffee away when he finds out. Found. Clint Barton, Boy Detective by damalur.
The second fic, I think I read this one on LJ but I'm not positive, was either gen or Tony/Steve. The team is trapped in a cave with basically no means for escape. The Iron Man suit is in ruins, so Tony can't blast them all out. What Tony eventually does is create a bomb (or something) to blow up the debris blocking the way. The thing is, he has to remove the arc reactor for the bomb to work (which he doesn't tell anyone). Found. Blow Out by xaritomene.