Giving in to one's baser instincts

Mark looked up at the cliff wall towering above her.  She and Sara were standing at the bottom of a glacial valley, and a steep peak shot several hundred feet almost straight up.  Not quite Half Dome, but it was the nearest thing Mark could think of. 

The trip there had been an adventure in itself.  Though only a few hundred miles from their previous perch atop Mount McKinley, they had gone the long way: twice around the earth.  It had only taken a few minutes, and Mark was astonished to learn that even at those hypersonic speeds, she and Sara could still carry on a normal conversation.  Mark had tried to wrap her mind around how she could hear words that were already dozens of miles behind them by the time they should have reached her ears, but she might as well have tried to determine how, after moving at such blinding speeds, their hair could look as if it had just come from the stylist.  They had evolved beyond rational explanations.  Sara had said that they lived by their own laws now.  Mark was just starting to realized that her words also applied to the laws of science and nature. 

"So now what?" she asked, looking up at the sheer rock wall soaring into the darkness above them.

"Now we smash," Sara said brightly.

"You're shitting me.  Couldn't we start on a mailbox or something?"

"Chicken?"

"It's all going to come down on top of us."

"Your point being...?

Mark sighed.  Sara seemed to be adapting to this much better than she was.  She had always been the rational one, the conservative one.  For Mark, just knowing she had superpowers was not enough.  The old thought patterns were too deeply etched in her brain to truly cut loose.  She supposed that this was Sara's way of helping her to get over herself.

"C'mon, it'll be fun!" Sara said, taking a swipe at the wall.  A huge fissure opened in the surface, and boulders cascaded down on top of them from a crumbling ledge above.  Mark found them easy to dodge with her accelerated speed and reflexes.  Sara just let them hit her.  They bounced off of her as if they were made of foam. She was only using a fraction of her strength.  Another swing caused the rock face in front of her to crumble, creating a niche in the rock big enough to drive a truck into. 

"Your turn!" she said.

Mark gave a half-hearted swat at the rock, no more than a light slap.  She was met with an avalanche of debris falling atop her.  Boulders that would have crushed an elephant cracked and shattered as they hit her.  She jumped atop the rubble, feeling strong and invincible.  She wound up and gave the cliff a really good punch.

Almost at once, the entire mountain came down on top of them.  One minute there was a cliff, the next is was no more than a vast pile of rubble with two amazonian superwoman on the bottom.  Almost simultaneously, they erupted up out of the rocks, boring through hundreds of tons of stone in less than a second.  They hovered together a hundred yards over the immense dust cloud they had kicked up.  They shook the dirt off of themselves by vibrating at ultrasonic speeds (their outfits had not sustained so much as a scratch or stain) and then the two of them almost collapsed laughing. 

"That was great!" Mark cried.  "I feel so strong!"

"You are so strong," Sara said, beaming. "And that's just a fraction of what you can do."

"I feel...good," Mark said, her hands roving over her hips.  "I mean...wow."

"I know. Right?  The more I use my power, the hornier I get."

"Sara, did you program this in? It doesn't seem like the logical effect of any of our other powers."

"Who cares?" Sara laughed.  "It's like a bonus, as I see it.  And we deserve it.  We're goddesses, after all."

Mark didn't argue.  She was too busy experiencing the new sensations.  It felt different as a woman.  She had expected a more localized sensation in her pussy, but it was more like an urgency she felt all over her body.  She wondered what it would be like to be penetrated.  In her mind, she was still a man, but she was haivng to face the fact that she might have to put that life behind her.  Would sex with a man even be possible in this body?  Sara had tried it with her old form, and it had nearly killed her.

"I can read your mind, you know," Sara said.  She had used her speed to sneak up right behind Mark. 
"Already fantasizing about sleeping with men? I don't know if I should feel betrayed or not."

Mark was flummoxed.  "No! It's not like that!  I mean...well, I was curious. But it's not like I'm going to do anything about it."

"Why not?" Sara asked.  She had a sly look about her.  "Honey, there is no mere mortal who can satisfy you now.  Trust me, I know.  If you want to play, go right ahead. I know you'll always be there for me, and I'll always be there for you."

Mark frowned.  "Sara..."

"New rules, remember?" She embraced Mark from behind.  Mark's arousal was not lessened by the feel of Sara's breasts pushing into her back.  "Besides, you'll probably kill anyone you tried it with, so there's no need to worry."

"I can't believe you just said that. Being super doesn't mean we give up on our values."

"Do you really think I've become some kind of monster?" Sara's voice had just a hint of an edge to it.  Mark realized that the snugness of her embrace could probably have crushed a submarine.

"Sara...I..."

"You don't have to say it.  I can feel it in you.  I am what I am, Mark.  You're the one who's in serious denial."

"I'm the one who's still part-way human."

Mark expected Sara to fly off the handle at his remark, but she remained surprisingly calm.  "You can't believe it, can you? But you're going to have to face facts.  We're not humans anymore.  We're goddesses." Sara was grinding against Mark now.  The sensation was getting to become unbearable.
"Sara, I'm not ready for this."

"You're ready.  I can feel you're ready. Your mind and body both scream that you're ready." She spun Mark around and held her tight, mashing their breasts together. 

"Sara..." But Mark's words were cut short with a kiss.  Mark could no longer resist.  Letting her lust do the thinking was so much easier.  While they were locked together, Sara pulled off Mark's skimpy outfit. Mark looked down at her naked body for the first time. It was disorienting, looking at a woman's body from this angle, but it was less strange than she had feared. It was her body, after all, and it was challenging to remember what her old one had looked like from this angle.  Sara's hands were everywhere. Mark felt the touch as gentle, but knowing that Sara's caresses were enough to sink an aircraft carrier was an even greater turn-on.  Soon a second outfit joined the first on the pile of rubble below.

They did it in Hawaii.  And Bali. And on Everest.  And on the Great Wall (parts of which required major restoration afterward).  And over the tip of the Eiffel Tower.  Sara, who claimed never to have feelings for another woman, proved to be an excellent lesbian lover, knowing exactly what Mark needed at all times.  Mark, for her part, go over the strangeness of being the oposite gender with her first climax, and she was able to please Sara in ways that had never been possible in her old body.
It was hard to say how long they made lover, for on their trips around the world they had crossed dozens of time zones.  At long last, they lay satisfied and panting on a beach in Spain.

"Mark isn't going to work anymore, you know," Sara observed while they looked up at the stars. 

"It's my name.  Don't you like it anymore?"

"You are so not a Mark.  Why don't you pick a girl name?  How about Marcia?"

"Too Brady.  How about Monique?"

Sara laughed. "Maybe if you become Super-Maid.  But that doesn't suit you either.  What about Mara?"

"Mara and Sara?"

"Ugh.  You're right.  Never mind.  That would be bad even if we weren't twins."

"Maya is nice."

"Yeah, I like Maya."

"OK, call me Maya."

Sara rolled over to embrace her lover.  "All right, Maya.  Maya, I'm getting really horny again, and there are four continents you haven't made me cum on."

Maya grinned.  "Fine.  Race you to Australia."