The beach! A warm, relaxing place for ponies young and old, rich and poor to spend a wonderful day. It was no different for Princesses.

Well. A little different. There was the few guards placed around the beach. Though they tried to blend into the crowd, their serious nature always made it obvious. There was also the tent they used. It was nothing amazing as Celestia wanted something modest. So it was just big enough for two alicorns to change.

Luna yawned and rubbed her eyes that were hidden behind her sunglasses. "Really sister. You could have just gone on your own" She grumbled as she looked over towards her nude sister as she changed.

"Oh but that would be nowhere near as fun!" Tia giggled with a little twirl as she started putting her - well calling it a swimsuit was a bit generous. It was a bit of fabric that barely hid enough to be legal. "Besides. I need you here~" She cooed as she tied her top and leaned into Luna.

Luna raised a brow, trying to keep her eyes away from the more eye catching parts of her sister "Really now? And why would-"

Luna cut herself off with a gasp as Tia's warm hand dug into Luna's swim trunks. "Mmm~ Yes I need you here indeed~" She licked her lips as her horn lit, embracing Luna's mighty package in it's warmth. "After-all, I can't go out for a day at the beach without proper protection~" She said as she knelt in front of Luna, licking her lips as she looked up at her.

Luna knew that position and she knew that Tia knew how much she loved it. Even as Tia's hands moved away and she let her magic do all the work it barely affected how wonderful the view was. The way Tia watched her magic do it's work. The drool on her lips as she stared at Luna's package.

Luna grunted as she looked towards the entrance of the little tent they were in "Sister. Is this really, ngh~ really needed? Surely you could just use-"

"Tut, tut. Now, now. You and I both know that no sunscreen is better than yours~" Celestia said with a small giggle and a wink as her magic kept working

Luna sighed and let out a small moan as she looked down. Her shaft and balls, completely encased in her sister's magic. She wasn't sure how to describe it. It wasn't just stroking. It wasn't just massaging and fondling. It was everything together all at once. It felt just amazing. But not too amazing. No. Of course she wouldn't rush it when they were in public. Nothing stopping anyone from seeing their incestuous moment outside of a tiny bit of fabric.

Luna groaned, biting her lip "Still. If you could hurry it up, that'd be appreciated"

Tia rolled her eyes and leaned forward, gently licking the copious amount of seed leaking from it "Just let me have my fun and you'll get much more when we get home~" She cooed before leaning back. She loved watching Luna try her best to keep quiet. It was so cute. Her little grunts and moans. The way her cock throbbed and jumped with each breath.

"T-Tia please." Luna whined "I haven't- it's been a while"

Now Tia understood why she was so needy today. She hadn't cum in a while. Well it was true that Twilight hadn't visited in some time and she herself had been too busy for her sister in the last few months. "Oh Lulu dear~ I'll take care of you when we get home~"

Luna gasped as she felt the pressure and speed of the magic increase. It was feeling harder and harder to hold back. But she looked down and could tell on Tia's face. It was time. Luna's moan was long and low, even as she tried to keep quiet. Her seed flew through the air, landing on the tent's inner walls, the sand but most importantly, onto Tia's coat.

Tia moaned as her sister's hot seed landed on her. It felt wonderful. "Mmm~ That's it little sister~ Cover me~" She cooed as she started caressing herself, pushing the cum along each and every bit of her body.

Luna panted as she watched her sister. It was hard to admit but watching her sister cover herself in cum, pushing it into her coat and knowing that she was going to go onto the beach like that, walking past so many ponies who would have no idea what her "Sunscreen" Really was.

Tia giggled as she stood, stretching before she gently pushed her sister's package away into her own swimsuit "Thank you Lulu" She kissed to punctuate herself and gently tapped Luna's package before walking away, and into the Sunlight where all could see.

Luna groaned as she left, trying to glare, only for her gaze to lower and watch her leave. "Dammit Tia... You don't even need Sunscreen." She mumbled to herself before sighing and following. She would have to ensure that Tia joined her tonight. Just seeing her covered was nowhere near enough for Luna's tastes.

Author's Note

a quick, short thing. I actually added quite a bit against the original. But the original was like... half this length and I hated how short that was. So I added a little more scene setup.