The Doctor, Derpy, Sparkler, and Dinky were in the main contol room of the TARDIS. Sparkler and Dinky werte rolling ball across the TARDIS floor, The Doctor was at the controlls and monitoring the TARDIS and Derpy was on the couch, watching her children as they played when somepony knocked on the door.
"Who could that be?", Derpy quetioned as she got up from the cough and onto her hooves.
"I'll get it Moma", Sparkler said as she hoped up from the ground.
When she opened the door she saw a foal with a teal coat and a dark teal with lighter striped mane and tail. The foal giggled at Sparkler's apperence. Sparkler picked the foal up with her magic and held the foal in her fron right hoof.
"Sparkler who was it at the door", Derpy asked keeping her eyes on Dinky still playing around on the floor.
Sparkler turned around with the foal in her hoof and said, "This". Everypony turned to look at Sparkler and saw the foal in her hoof then gaspecd at the sight. Dinky was the first to come up to Sparkler and she did so with much excitment in her face and spirit.
"Aww, she's so cute, can I hold her, can we keep her moma, can we, can we, can we, pleeeeeeeease!!!", Dinky cried out.
"Hang on Dinky", The Doctor said picking her up in his front left hoof, "We don't know who's foal this is", he continued.
"But Doctor", Derpy interruped will putting Dinky back on the ground, "Whoever's foal this is they must not want her anymore, because, what other reason is there for leaving the foal in front of someplace", she continued.
"Guess your right Derpy", The Doctor said.
"So can we keep her Moma", Dinky said with her face lighting up again.
"I guess we kind of have too Dinky", Derpy said.
"YEEEEEEEEEEEEEEEEEYYYYYY", Dinmky shouted with excitment.
"Moma, what are we going to call her while we have her?", Sparkler quetioned.
"Hmmmmm", Derpy thought for a second, "How about we call her, Crystal", Derpy continued.
"That sounds like a good name for a cute little foal like her", Dinky said.
"Then it's settled, Crystal it is", Sparkler said proudly.