Warning: Slightly sad/dark
TQM EDIT: Seriously... this shit is dark! Don't say I didn't warn ya.
Don't Tell Anypony by VelvetHeart
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Four fillies lay sleeping, clustered together in a curled up, fluffy mass of bumps, chests rising and falling with each breath. Among them lay the shredded remains of a sleepover gone right, burnt 'smores and empty popcorn boxes. Little Sweetie Belle'd somehow managed to end up laying in one of the mushy marshmallow treats, leaving it stuck to her head like a cartoonish lump.
A sight missing a night with the mares for. A faint smile quirked Lero's lips as he watched the little cluster through sleepy eyes. His bed awaited...
...making soft whimpering sounds. Large eyes looked out from underneath, glistening moistly in the darkness. "L-lero, mister?"
"Pipsqueak, isn't it? Your friends are all in the living room, what are you doing under my bed?" Lero sat down, leaning in with an arm across the bed to watch the small, tear-stained face.
"I... I dreamed I was back."
"Back where?"
"Back in Trottingham. Y-you wouldn't understand."
"Well, maybe I will, if you tell me."
"...Promise you won't tell anypony?"
"Promise."
"I-it was in the living room. There was crying, but the adults were ignoring it. They were talking about everything but the crying, loudly, so they could pretend they couldn't hear it. But they could. We could too, in the corner with the other foals. We were playing, 'cause we'd been told to go play. We didn't feel like it, didn't have our hearts in it. We didn't even speak as we pushed our toys around.
I had a little sister, you see. S-she'd only just been born, and the adults were upset. They'd wanted a colt. You see, a filly costs lots of money. Food and such, until she's old enough for a job. But a colt... you can rent out a colt for money, to do... things. Sometimes a rich pony would come and...
...a-and rent. And we'd have money to help us keep the house and pay for the stuff daddy needed. But a filly... we couldn't afford another useless mouth s-so they pretended she'd never been born.
They told each other it was a stillbirth, while all the time she was crying. She was hungry, cold and alone and nopony would come to her crying. She kept crying and crying and crying and I wished she would just go and die already.
And then she suddenly went quiet. I-I felt so guilty. L-like my wish made her die. I never saw her again. My little sister died without ever seeing any pony. She died alone.
Sometimes I still dream about it. Sometimes I dream about holding her so she won't die alone.
Can I sleep with you tonight, Lero. Please?"