When she was a teenager however, she made a journal about herself and what she would learn about her developing body. When she dug it up at her parent's house following a friendly visit, she delved into it and couldn't help but roll her eyes at some of the more dorky and naive things she said in her youth, but one section that interested her was an entry about when she jumped into a swimming pool naked and began fingering herself furiously, much to her enjoyment. Feeling a warm, lustful feeling inside her, she set the journal aside and when she would go back to the castle, she would relive those memories once more.
When she returned to the castle that night, she descended to the lower floors of the castle and into the royal baths, with a nice, deep pool waiting for her. As she flicked the lights on, she found the pool cover was pulled over the surface. With a quick pulse of telekinetic magic, she pulled the cover aside to make a small gap she could dive in. Stripping down completely until she was naked, her breasts bobbing with each excited step as she looked at the clear water and smiled, "This is going to be so much fun! Here goes..."
With a few shaky breaths, the alicorn dove into the pool and swam down into the depths, remarking the pool's depth with mild surprise, just reaching a deep 18ft depth. She touched the bottom of the pool as she cupped her quivering pussy, already excited from what was going to come. She pinched her nipple as she sunk onto her knees, moaning in pleasure as bubbles flowed freely from her mouth, "Mmnngblbl~..."
Twilight looked up as her exhaled bubbles pooled on the cover above, her only air pocket quite a swim away from her position, "Oh my, so much air being lost~..." She thought as a finger slipped into her moist folds.
As she let out another bubbly gasp, she brought her nipple to her mouth and gave it a quick suckle before squealing again, "Nyaaahhgbl!~ Ohbl thiglb ib so goodghkl!"
Her wings flapped slowly in the water, her body stiffening as she tried to hold her dwindling breath, her fingers still digging deep into her folds, nearing her orgasm as she tried to hold her breath. "Mmmffph! Mmgblgblblmmmbl!!"
Soon, the alicorn couldn't hold out and eventually came into the water, letting out a loud, bubbly scream as her juices flowed freely into the water, "NNNGHGBLAAAAHHH!~~"
The princess felt her lungs involuntarily convulse as her body reacted with a lurch forward as Twilight held onto her remaining air, her fingers still perched in her pussy, "That was a rush! Need to breathe..."
As she kicked and paddled with her free arm, she perched her head to the surface to greet it with a loud gasp of fresh air...
...Only for her head to bounce off the cover. "Nngblbhk?!"
She felt around the cover, she was certain the air pocket was here, her hands running over the plastic cover with growing panic. She shook her head and pushed off the wall, thinking she went the wrong way. After swimming down and taking another look at her surroundings, discovering something odd.
"Where's my opening? I swear I opened one over here!"
She made a beeline for the the next ledge and found the cover closed up tight. The princess then came to a shocking realisation, "Oh no, I'm trapped under the pool cover!"
She began beating the plastic cover with her hands, calling out to anyone nearby, "HEEELLPGBLBL!!"
Twilight began hiccuping her air as it pooled on the surface, her legs kicking wildly. She tried to suck up the air bubbles but found herself taking a drink of pool water which made her cough her air out in a final gasp of desperation, triggering another orgasm, "Hrrk! Nngblbl!! Mmgblblaaagbl!!"
Soon, the princess was exhausted as she soon fell into a tired slumber, water starting to flow freely into their lungs as she sunk into the depths of the pool. She would never breathe again, but she went out with a smile on her face and on one hell of an orgasm. And that was enough to keep her satisfied in her drowned state.
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