Another long day of work on the farm.  Difficult but gratifying.  Apple Bloom sits on her bed and takes off her boots and pants, then her shirt and tosss them into her hamper.  She's so tired, she just flops on her side in bed and is rapidly drifting off to sleep, half dressed.  She lays in a haze for a while, not quite asleep, but not really awake yet.  

She has no idea how long she lay there, but she hears sounds from the bathroom she and her siblings all share.  She heard sounds last night, too... somehow showering, then other sounds she didn't understand.  It sounded like Big Mac and Applejack but the grunts and moans and squeaking sounds of flesh on wet tile weren't familiar to her.  Hearing the sounds again tonight got her wondering so she sits back up and sleepily wanders to the bathroom to see what's going on.

Her eyes adjusting from the dark of the bedroom and hallway to the bright light of the bathroom, she hears the the shower and masculine grunting sounds from the night before, but not the rest from the night before.  As her eyes adjust, she seems Big Mac taking a shower.  She had seen his  muscular form all her life, and even seen him naked once or twice (necessitating her first discussion with Applejack about the difference between boys and girls), but she had never seen him in this state!  She had no idea his cock got so BIG!

Big Mac, oblivious to her presence, continues stroking himself, making low deep grunting sounds, stroking away the stresses of the day under the hot shower.    Apple Bloom stands, transfixed, wondering what he was doing.  Her arms crossed to keep herself warm, she slowly drops them and her hands slide over her body casually.  As is habit, she absentmindedly slips a hand into her panties to touch herself.  It was always just something she did.  It felt nice, but it was more of a thing to do, something to play with, without being much more in the past.  But this time, he found that her pussy was very sensitive and plumper than usual.   This was a different kind of feeling and she intended to see where it took her.

She couldn't take her eyes off her brother as she continued to touch herself.   His grunting getting more emphatic as he continued.  He places one hand on the wall of the shower and leads forward, eyes clenched hard, as he continues to stroke with his other hand.  Finally he gasps and a few strokes later, shoots cum all over the wall of the shower, dripping and mixing with the water.   Apple Bloom's touches have gotten more frantic, matching his own pace and passionate sounds.  She makes a little sound as her rubbing hits something extra good feeling.  Big Mac, coming out of his own daze, jumps a little and turns to see her standing in the doorway, his shrinking, but still sizeable, cock still in his hand.  His eyes grow huge: "NOPE!"

Apple Bloom jumps and pulls her hand out of her panties but freezes, not knowing what to do.   Big Mac rapidly raps himself in a towel and ushers her back to her room.  He lays her down and pulls the covers up to her chin.  She's holding back tears and apologizes profusely.  He puts a hand on her head and smiles reassuringly.  She sniffles a little but calms down and eventually smiles back at him.  Her eyes fall to his lap and see the thick bulge of his cock under the towel and blushes.   "Big Mac?  I feel all anxious.  I've never felt like this before and I don't know why.  I don't know if I can sleep like this.  Is there a way to make it stop?"

Big Mac looks confused for a second.  Then concerned.  Then he blushes.  "Y-y-yup.." he timidly responds, before he reaches for the covers.
[to be continued]