"Oh shit!" Remus said before helping Snape up, which, considering how big he was, was not an easy task. He took the bag they had prepared for Snape and moved towards the fire.
"Do you think you can floo to St Mungos?" Remus asked and Snape nodded slowly. Remus threw some powder into the fire and he and Snape flooed to St Mungos reception. They headed up to the floor for emergencies and before they knew it, they found themselves in the delivery room and Snape was squeezing the life out of Remus's hand.
"On the count of 3, push. 1...2...3" The healer said and Snape pushed as hard as he could.
"Harder, push harder!" He yelled.
"I can't!" Snape panted.
"Do it for me Sevvie!" Remus said and Snape breathed before pushing again.
"Congratulations, you have a beautiful baby girl! The next one's on the way!" The healer said holding up a baby girl with red hair and green eyes.
"Girl? Another one?" Snape breathed.
"PUSH!" The healer said and he pushed but the baby didn't seem to want to come out. Eventually, the healer said...
"Congratulations! It's a boy!" And held up a little baby with black hair and blue eyes.
They took them both off and cleaned them off before giving them to the proud but exhausted parents
"Dear god, she looks just Lily and he looks like..." Remus said and Snape finished for him and shocked Remus.
"Sirius." He said with a smile and the babies were placed back into a large crib while the parents filled out the birth certificates.
Sirius looked over to the little girl who seemed to be smiling and a familiar voice (he got the feeling only he could hear it) said to him.
"Hello Sirius!" He realised where he heard it and groaned at the thought of Lily for a sister.