Becka needed to cum, bad. Alone in her room she had three fingers in her pussy and was frantically stroking her cock imagining the protagonist from the romance novel she'd just finished naked and horny for her. Becka's triple D boobs bounced with each stroke of her hands adding to the desperation for release that she was hurtling towards.
With a groan of frustration she finally got herself off. Her six pack abs flexing as her cock exploded like a gun. The first spurt of cum hitting her cheek. She slumped back against the pillows, spent at last.
Brandi could hear her older sister masturbating again. She couldn't understand why Becka just didn't get a boyfriend. Even one just to take care of her... needs. God knows she was pretty enough. Brandi shrugged and continue down the hallway to her own room.
Mom had told Becka ever since she could remember. It had to be kept a secret. It was in their DNA but would skip a couple generations. The last one had been her Grandpa's sister, Sylvia. A spinstress who lived alone, she'd died the year Becka had graduated high school. The money she left them was putting Brandi and her through college.
Rumors had been that it had been a suicide. Mom seemed to be deeply affected by her passing, and had somewhat withdrawn from her usual bubbly self, seeming to be more contemplative, since.
Still, Becka had heeded Mom's advice. Even Brandi didn't know. As puberty hit and Becka, and her cock began to really grow, it had just served to make her more vigilant in making sure her secret remained so.
Both girls were still virgins. At 18, Brandi had dated her share. Fooled around with some guys, but for some reason hadn't found anyone yet she wanted to go all the way with. At five foot seven inches, she had long wavy dark locks and a gymnast's body, with perky C cup breasts, so there'd been no lack of interest. She just wanted her first time to be special.
Her sister, on the other hand, she just didn't get. Becka was built like a brick house. At six foot one with big firm boobs, and a narrow waist she looked like a female body builder, only it was all natural. Still, she seemed to go out of her way to avoid forming bonds with anyone. Plenty of guys had tried, but nobody had been able to crack the blond bombshell's bunker.
It was their folks 25
th
Anniversary, and they were going on a cruise. Becka and Brandi were to mind the store while they were gone. Brandi was actually looking forward to spending some time with her sis. Brandi had been invited to a party by some college friends and had coaxed Becka into coming along.
It was pretty low key, but Becka was clearly out of her element. Brandi was catching up with some friends and Becka kind of sat out of the way swilling down beers. Never much of a drinker, it wasn't long before she was mostly out of it. Brandi hadn't picked up on it right away, and when she did, she said a quick round of goodbyes and squired her half-in-the-bag sis, out the door.
"Jesus, Brandi! I gotta take a leak! How longs it gonna be before we get home?" she slurred.
"Twenty minutes or so. Can you make it that long?" Brandi estimated.
"I don't think so." Becka said, dejectedly.
"Well there's a park just a half a block up from here." Brandi suggested.
"That'll do." Becka managed.
Becka wasn't thinking straight. Her teeth were floating she had to pee so bad when they got to the park. Leaning against a tree she whipped out her cock and began to relieve herself, forgetting in her haste that her sister was standing right there.
"Holy Shit! Becka, you have a cock!" Brandi choked out.
"Oh Fuck! Forget what you just saw, Sis. Please?" Becka begged, suddenly realizing what she'd just done.
"I don't know if that's possible, Becka." Brandi replied.
"For me, Sis? Please?" Becka begged again.
"I'll try." Brandi offered.
They got back to the car and drove the rest of the way home in silence. Becka had sobered up considerably by the time they'd arrived.
"Well, G'nite Sis." Becka said.
"Wait... can I ask you something first?" Brandi said.
"I guess. Is it about my cock?" Becka surmised.
"Yeah. How could I have not known?" Brandi wondered.
"I go to pretty good lengths to keep it hid, sis." Becka replied.
"Even from your own family?" Brandi asked.
"Mom and Dad know. I was born like this, after all." Becka responded. "Mom's aunt Sylvia knew too. She was Futanari as well."
"I had no idea! Why would you keep that from me? Your own sister?" Brandi wondered.
"Oh, there are plenty of good reasons for that. But mostly I didn't want you worrying..." Becka explained.
"I don't know. It kinda explains your lack of dating, though." Brandi admitted.
"Yeah, it's not something I'm very comfortable breaking the ice about." Becka agreed.
"Can I see?" Brandi asked.
"Do you really want to?" Becka looked seriously at her sister.
"Yeah, I think I do... if it wouldn't be weird for you, that is." Brandi said.
Becka slipped off her sweatpants and panties, allowing her cock to dangle freely between her legs.
"God, Becka, it's big... how..." Brandi asked.
"Around thirteen inches when I'm hard." Becka replied with just a hint of pride.
Brandi took a good long look. Her sister's balls hung pendulously, nearly covering any view of her vagina. It looked fierce. It looked powerful. She was almost jealous, until she remembered that it was also the reason her sister couldn't date.
"I've heard you masturbating a few times, does it...I mean do you..." Brandi tried to ask.
"Yeah. I can make a really mess if I don't watch it." Becka answered grinning.
"I'm sorry. This has got to be weird for you." Brandi consoled.