Brother and Sister... or Marefriend and Coltfriend?

Cake Twins, Pound and Pumpkin, now at 15 years old, had just finished cleaning up Sugarcube Corner for their boss, Pinkie Pie, who was in Canterlot for the day.

"Good sales for today", Pound Cake said as he counted the bits inside the register.

"Great!", Pumpkin Cake said, "Pinkie Pie will be happy!"

"Eeyup. So, I'm going to the arcade. Wanna come?"

"Oh... no thanks, Pound. I... have something to do". Pumpkin Cake was breaking a light sweat and nervously shifting her eyes around. Pound Cake raised his eyebrow.

"Oooohhhhh... Kayyyyyy", he said, "Well... have fun with that". He flew out the front door, closing it behind him. Pumpkin Cake went up to her room, closed and locked the door behind her, and laid down on her bed. Spreading her hind legs, she started rubbing her marehood.

Pumpkin Cake was in heat. VERY in heat. She had been going through puberty ever since she was 13. She was too young to do it with another stallion, and she knew that her parents, Carrot Cake and Cup Cake, would kill her if she did that. Then, she tried masturbation, which pretty much felt like the real deal. Every time Pinkie Pie and Pound Cake were either gone or asleep, she would touch herself.

Pumpkin Cake sighed as she rubbed her feminine slit. It felt really good. She closed her eyes and spat onto her hoof, rubbing harder with her soaked hoof.

"Ohhhh...", she said, her voice quivering with pleasure, "Yesssssss..."

She pushed a little, inserting her hoof into her marehood. She kept pushing and soon, she had about a quarter of her front leg inside of herself. With her hoof still inside of herself, she rolled over and laid on her stomach. She started to hump, feeling her front leg slide in and out of herself.

"Yes! Yes!", she said, "Harder!"

But then, right when she felt her climax coming, a knock at the front door interrupted her fun. She growled loudly and went downstairs. She swung the door open, seeing the mailmare, Derpy Hooves, standing outside.

"Package for Pumpkin Cake", she said.

"Oh... thanks, Derpy!", Pumpkin Cake said, slamming the door shut. She held the package in her magic and ran up to her room. Locking the door, she sat down on her bed and opened the package.

Smiling, she pulled out the item it was holding. A large, rubber vibrating dildo. She laid back down, kicked the box off of the bed, and spread her hind legs. She took the dildo into her magic and placed the tip of it against her marehood and slid it in, She smiled as she pressed the button, and the dildo started to vibrate and sighed as she felt the vibration.

She rested her head against the pillow and imagined somepony ramming her cunt.

"Yes! Harder!", she said, her hind legs twitching with pleasure. At that point, she felt a pressure in her bladder. Smiling, she spread them wider and let her bladder go. Her warm urine started to pour out of her hole and onto the dildo and the comforter. She closed her eyes and imagined that somepony was pissing inside of her.

"Yes! Oh... you're so big! Ugh... Cum inside me!"

She then felt another intense pressure. Her climax was close. She let her tongue hang out of her mouth and gasped. Then, she exploded as her juice poured out of her.

"P... Pound!", she screamed as she imagined her own brother ramming her. After it ended, she pulled the toy out of herself and stashed it. She cleaned up her mess and walked downstairs.

Pound Cake had made it back and was in the living room. Pumpkin Cake got nervous, but was able to walk downstairs.

"H-hey, Pound", she said.

"Hey, Sis", he said, "Mare, the most exciting games were all out of order".

"Oh..."

"Anyway, what were you-?" A sharp smell attacked his muzzle, making him wince. "What is that funny smell?" Pumpkin Cake panicked as she looked down. Her urine, and her vaginal juice was still stuck to her marehood.

"I... I don't smell anything".

"You don't smell that? It smells like somepony peed their self while masturbating". Pumpkin Cake looked down with a look of guilt. "Pumpkin?"

"Pound... there's something I have to tell you".

"What?" Taking a deep breath, she told him.

"I'm in heat!" Pound Cake was very surprised. Pumpkin Cake, however, was too embarrassed to face him. She ran up to her room.

"Sis, wait!", Pound Cake said, flying up to her room. He could hear Pumpkin Cake crying into her pillow. "Sis?"

"GO AWAY!", Pumpkin Cake screamed.

"Sis, open up. I just want to talk". The lock clicked and the door opened. Pound Cake walked in and closed the door behind him. He then flew over to the bed and sat down on her bed. Pumpkin Cake sat up, but hung her head, not letting her brother see her face.

"What do you want?", she said.

"Pumpkin", Pound Cake said, "You were touching yourself, weren't you?"

"Y...yes".

"You're... horny right now?"

"Yes. Very. I'm so ashamed".

"Sis, don't be. Everypony goes through this. I already have".

"But..." Pound Cake placed his hoof over Pumpkin Cake's mouth.

"I'm not disgusted or anything. I was just surprised". Pumpkin Cake smiled as she hugged her brother.

"Thank you... Pound".

"No problem, Pumpkin". Pumpkin Cake then looked serious.

"Pound..."

"Yes?"

"There's something I want to ask you".

"What?"

"Well... I know we're brother and sister, but... I was... uh... wondering if you would... if I could... uh-".

She was interrupted when Pound Cake placed his muzzle on her's, locking in a kiss. Pumpkin Cake's eyes went big. Her brother was actually kissing her. Pound Cake stopped his kissing.

"I'd love to", he said, smoothing his sister's cheek. Pumpkin Cake smiled as she licked her brother's cheek and nuzzled it.

"Thank you".

"No problem". He pushed his sister back, letting her lay on her back. He laid on her and kept his muzzle on her's. Pumpkin Cake placed her hooves on the back of her brother's neck and rubbed his mane. Wanting to go further, Pumpkin Cake slipped her tongue into Pound Cake's mouth.

A light moan escaped Pound Cake as he felt his sister's tongue touch the inside of his mouth. His wings became erect and unable to fold in. Pumpkin Cake felt as horny as she could be. Her marehood started to leak and her nipples started to poke out through her coat.

"Enough teasing!", she said, eager to start, "Let's go!"

"OK, OK!", Pound Cake said. He started to move down, with his tongue running down her chest. Pumpkin Cake shivered as his wet tongue ran down her chest. After a while, she felt something touch her marehood.

Pound Cake smiled as he placed his erect penis against his sister's virgin marehood. Giving it a light push, the tip of his rod slid into her. After that, he slid his whole stick into her hole. Pumpkin Cake moaned as she felt the length of her brother's penis inside of her.

"Ugh... You're so big!", she said.

"Thanks", Pound Cake said, "And yet, I'm still a virgin". Pumpkin Cake giggled.

"Not for long!"

"Right. So... I'm going to hump now. Ready?"

"Yes! I'm begging!"

Pound Cake began to hump his sister slowly. Pumpkin Cake moaned loudly as she felt her brother's penis slide in and out of her marehood. She pulled his head down to kiss him. She locked in a major kiss while he humped her. Pound Cake, feeling her tongue inside of his mouth, began to hump her fast and hard. A loud moan and Pound Cake came, sending his hot load into Pumpkin Cake. Pumpkin Cake's hind legs started to spazz out and she started to moan loudly.

"Yes!", she said, "Oh Pound! That feels so good!"

"I'm glad you like it. I do". His orgasm lasted for about another minute, then stopped. He got off of his sister and laid down next to her, panting heavily. Pumpkin Cake shifted over to him and cuddled him tight.

"Pound...", she said, whispering into his ear.

"Yes, Pumpkin?", Pound Cake said back.

"I love you".

"I love you, too". They cuddled until they caught their breaths.

"OK...", Pound Cake said, "What do you want to do now?" Pumpkin Cake smiled.

"The same thing we just did", Pumpkin Cake said, "but this time, I want to be on top".

"OK". Pound Cake opened his hind legs, exposing his full still-erect penis. Pumpkin Cake, eager to get started, moved to the end of the bed. She was right in front of her brother's penis.

Before Pumpkin Cake could even move, an urge made her do something else. She moved closer to his penis and placed her muzzle against it. She inhaled for about five seconds.

Pound Cake's penis smelled wonderful. She took another inhale, enjoying the smell. Then, she opened her mouth, but didn't move. She really didn't think Pound Cake would like that.

However, she felt something on her back of her head. She looked up. Pound Cake had his hoof on the back of her head. He nodded, approving her request. Smiling, she stuck out her tongue and gave it a lick.

Pumpkin Cake was very surprised. Her brother's penis tasted wonderful. She brought her mouth down to the pole and started to suck.

Pound Cake moaned as he felt his sister's warm, wet mouth on his rod. He placed his hooves in her mane and and moved her head up and down. The pleasure felt really good. He let go of her head and Pumpkin Cake continued to make her motions.

Right when he felt the need to release a second load, Pumpkin Cake stopped. He looked down at her with a near-rage look on his face.

"Sorry, Pound", Pumpkin Cake said, her saliva dripping from her chin, "I want you to cum when you're inside me".

She got up and moved on top of her brother, her marehood over his penis. She lowered her lower body to the point where the tip of Pound Cake's penis was touching her feminine lips. She kept going, feeling the rod slide into her temple. Soon, the whole penis was inside of her.

She started to hump slowly. Pound Cake felt his penis slide in and out of his sister's cunt. He pulled her down to him and locked in another kiss. Pumpkin Cake moaned as she kept humping. After another five minutes, they both moaned loudly. Both exploded. Pumpkin Cake sent a load of vaginal juice onto her brother's penis, and Pound Cake sent a second load of cum into his sister's marehood.

Pumpkin Cake got off of Pound Cake and laid down next to him. Pound Cake pulled his sister into a hug and cuddled her tight. Pumpkin Cake buried her face into her brother's coat as she caught her breath. Pound Cake kissed her muzzle and Pumpkin Cake returned the kiss.

"OK, Pound", she said, "I'm satisfied".

"Good", Pound Cake said, "I'm glad you are". He let go of his sister and Pumpkin Cake smiled.

"So, maybe we should get cleaned up?"

"Yep". The twins got out of the bed and went into the bathroom to get cleaned up.

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The twins sighed as they relaxed in the bathtub. The two loved to bathe together, and it saved water. Pound Cake cuddled Pumpkin Cake as he washed her mane.

"Feel good?", he asked her.

"Yes", Pumpkin Cake said, "Very good".

"OK". He finished washing his sister's mane and moved on to her tail. "So... why did you want me to calm your urges?"

"Well... you're the only stallion that loves me, besides Dad, and you know Mom and Dad would kill me if I did it with another stallion underage".

"Oh... so, did you like it?"

"I loved it, and I love you!" She kissed her brother's muzzle, as did Pound Cake.

"I love you too, Pumpkin. So, you're like... my marefriend now?" Pumpkin Cake pulled her brother into a hug and kissed him for about a minute.

"Does that answer your question?"

"Yes it does".

The twins finished washing each other and got out of the bathroom.

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The twins were in the kitchen, enjoying a snack. Pound Cake was having a brownie sundae, and Pumpkin Cake was having a banana split.

After their snack, they put up their dishes and went up to their room. They got into bed and tucked themselves in. They cuddled each other.

"Goodnight, Pound", Pumpkin Cake said, "I love you".

"Goodnight, Pumpkin", Pound Cake said, "I love you, too".

They fell asleep with smiles on their faces.