needles and pinches

series: the things i let die (and what else i find) pairing(s): steve rogers (mcu)/james "bucky" barnes (mcu)/ tony stark (mcu) tags: angst, fluff and angst, unplanned pregnancy, pregnant tony stark, miscarriage, angst and hurt/comfort, hurt/comfort, tony stark has a heart, tony stark has self-esteem issues, tony stark needs a hug, steve rogers needs a hug, bucky barnes needs a hug, whump, polyamory, ambiguous/open ending, song: needles and pinches (georgia train), guilt, hopeful ending, minor pepper potts/james "rhodey" rhodes summary: one miscarriage is simply bad luck. two miscarriages mean problems. three will be dangerous, and any more than that... any more than that will be an utter failure. where tony stark suffers four miscarriages, and finds himself tumbling into a fifth with virtually no way out.