It was another night at the Avenger tower. Clint has gone home to his children, Natasha was hanging with Nick discussing plans for future missions, Thor was sleeping in his room and Bruce's was playing with the tools in the lab Tony gave him. Tony and Steve spent their time cuddling together on the couch watch something on tv. Suddenly the doorbell rang on the tower causing Tony to groan untangling himself for Steve's warm hold and walked to the door with the slight creak of the door hinges Tony was first blasted the chill of the winter wind and now peered into the warm glow of the New York night. With that a wail was heard from under his feet, he looked down to find small child about 3 or 4 months sitting naked in a cardboard box. Tony took the child in his arms noticing her freezing body temperature. Tony quickly dashed inside running to Steve infant still in hand. The infant was obviously a girl. She now looked at town with big wet brown doe eyes that just melted you and Tony could see the blonde tuffs of hair protruding from her scalp.
"Steve!" Tony said panicking slightly "Help"
Steve dashed to Tony to see the infant child being held in his arms.
"T-Tony..." Steve says wondering if it was his.
Tony quickly shook his head banishing his thoughts. Steve let out a breath of relief and stared at the young girl. Where did she come from? Who did she belong to? Why was she here? How did she get here? When did all of this happen? What is her backstory? Tony them saw there 2 year old son come out of his bed in iron man pjs.
"Peter?" Tony said as Peter yawned
"Daddy, papa. Who dat?" Peter questions looking at the naked infant.
"You're little sister." Tony gasps as Steve said that.
"You sure?" Tony asks?
"Well she needs a home. What better than one with to fathers and a big brother."
Tony smiles wide and tears up.
"What will me name her?"
"How about Emma May Rogers?!" Peter yells
The girl giggles and laughs at the new name.
"Well Emma it is. So we will say today's her birthday?"
Peter nodded and let out a big yawn. "ok well we will go shopping tomorrow for now. Bed." Steve threw Peter lightly catching him chuckling and Peter squealed and sucked his thumb. Tony smiles and looks down at the girl...he means Emma. She had so such chocolate brown eyes like Tony and blonde hair like Steve. And these adorable freckled dances on her face. "Jarvis bring down some of peter's old baby clothes" he said hating to see Emma so vulnerable. Soon a box and picked out this cute little pj. That sad. I love my daddy.

Emma giggles and smiles chewing on her fingers. It was a bit big. But will do for now. Tony kisses Emma's head and the cradled  her carrying her back to their bedroom we he found Steve on bed tickling their squealing son
"Cmon Steve and Petey time for bed."
Steve chuckles grabbing Peter and setting him in the bed. Tony laid Emma down as she let out a big yawn. Tony turned of the light and snuggled into bed. As a hush fell over the bedroom Steve and Tony heard peter's little voice pop out.
"I'll take care of you little sissy. Forever and ever." He kissed.
Tony could just see him and Steve grinning. His heart was soaring. But her knew they did have to legally adopt her. He prayed he would when. But for now he was lightly content with the little ball her hand on his chest and they all fell into a peaceful slumber.
"Let's start this new adventure." Was all Steve whispered into the darkness.