Rebecca sighed softly as she stood under the showerhead and let the cold water wash her from top to bottom.

She wished that the shower would wash away her sinful thoughts. Her mind rumbled with the sound of Abi's erotic moans from the night before. Whenever she would wander back to that moment, her heart would race a million miles a minute. She had never experienced anything like that before…and she wished with every fibre of her being that she could live through it again and more. The cold water did little to ease the heat that was coiling inside of her. If she didn't know any better, she would have guessed that she would have been steaming up the bathroom. It didn't help that her cock was throbbing aggressively in her hand, demanding more attention.

''Fuck, what is wrong with me?'' Rebecca muttered to herself.

The door was closed and the sound of the shower meant that Abi wouldn't overhear anything that Rebecca had to say.

''We're related. She's family. She's my grandmother. I shouldn't be doing this…''

Doing what, exactly?

Technically, they hadn't done anything. Other than catching Rebecca in the act one time, watching a film with very erotic scenes, and potentially overhearing each other masturbating through the bedroom wall…did any of that count as actually doing stuff together? Would it be the end of the world if Rebecca indulged in fantasies, even if those fantasies were the ultimate taboo?

The longer she thought, the more compelled she felt to slowly caress herself, stroking her aching dick to fill some kind of relief. A sigh escaped her lips as she wished for it to be Abi's hand on her. Not just her hand. She wanted more. She wanted to know what it would feel like to have Abi's lips on her cock, sliding up and down as she tried to take the massive organ deeper into her mouth. For whatever reason, Rebecca envisioned Abi as a blowjob queen. She was a badass. There was little doubt in Rebecca's mind that her grandmother could deepthroat her without any trouble.

Rebecca groaned and slammed her free hand against the shower wall. ''What am I thinking? This is wrong!''

Is that why it felt so good?

She closed her eyes and tried to forget about all the stress. But, the only way to find happiness was to think of Abi. Rebecca tried to think of the mundane and the trivial. That wasn't going to happen considering she was still jacking off in the shower and imagining that Abi was on her knees with her lips wrapped tightly around her shaft. Rebecca squeezed tighter and used the shower water to her advantage. Her digits slide up and down her erection with ease as Abi took over her mind.

''Fuck it!'' Rebecca grunted. ''Let me live a little.''

Lewd images of Abi flashed in front of her. God, it was bad enough that Rebecca already had a weakness for older women. Abi…she did things to Rebecca. The forbidden nature of their relationship added to the tension and sensuality. As Rebecca continued to build a vivid picture of Abi tending to her needs, her ears buzzed with the memory of last night and the sounds that reverberated through the walls. Rebecca was still convinced that Abi had heard her. They both knew what the other was doing and continued anyway. The thought of Abi fingering herself whilst listening to Rebecca moan was sending the young woman's excitement into the stratosphere.

Rebecca shouldn't have been proud of the fact her grandmother was possibly masturbating to the thought of her. But, she was. Rebecca believed it was a guilty pleasure that everyone felt. People love to think that they are another person's dream and can get them off with just a thought. Abi was certainly doing it for Rebecca. She stroked herself harder and faster; wondering what it would sound like to have Abi gagging on her cock. Her other hand reached down to cup her soaking wet balls, imagining that it was Abi's hand fondling them, edging her closer to an earth-shattering orgasm.

''Abi,'' Rebecca whispered huskily.

She didn't even care if she was caught. She had already ridden that train of embarrassment. In fact, she hoped for it. She wanted Abi to see how she felt. Rebecca wanted to stroll out of the bathroom, wet and naked, with her erection on full display for Abi to gawk at. Would she be as quick to drop to her knees as Rebecca's imagination would suggest? Rebecca thrust her hips and fisted her hard cock with growing intensity. Her guilt was down the drain as she fully embraced her taboo fantasy. If she knew that Abi felt the same way, she would march out of the shower, bend Abi over and fuck her from behind.

The last thought sent shivers down her spine.

Pumping her cock as fast as possible, she slipped into the fantasy of fucking Abi doggy-style. Was that a position Abi would enjoy? What would her favorite position be? Rebecca could ponder on that later. For now, she needed this release. She relayed Abi's delightful moans in her head once more as she rocked her hips and thought about fucking her. She squeezed her balls again. There was a part of her that wanted to cum as quickly as possible so that she could vacate the shower and not draw any suspicion from Abi. But, she also wanted to keep going. The thought of Abi's pussy clenching around every inch of her cock drove Rebecca deeper and deeper into a pit of lust and longing. Abi could take her. Rebecca knew that. She'd have the stamina despite her age. If they wanted, they could fuck against every piece of furniture in every room of this house.

Rebecca wanted that challenge with Abi.

But, if her grandmother didn't feel the same way, these would have to remain fantasies.

It wasn't what Rebecca wanted, however, she would have to live with it; at least, until the summer was over. Then, she could move on and find another woman who might help her take her mind away from these sinful thoughts.

Rebecca tilted her head and arched her back. She was on the verge of cumming. While the thought of pumping her load all over Abi's face and body was tempting, she liked the idea of cumming inside of her. The chances of Abi getting pregnant were non-existent, not just because of her age but also because Abi wasn't the type to have loads of children and stopped after Rebecca's mother. So, Rebecca could creampie her grandmother to her heart's desire.

That was a sentence that Rebecca never would have thought she'd consider before the summer started.

How did things get like this so quickly?

Just when Rebecca was about to explode, she heard a knock on the bathroom door.

''No way!'' She mumbled under her breath. The universe was really messing with her. She glanced around the curtain. ''Yeah?''

''I'm so very sorry, Rebecca,'' Abi called through the door. ''I think I might have lost something in the bathroom earlier and I need to see if it's there. It's urgent.''

Rebecca felt her cock throb at the sound of Abi's voice. She didn't know if she could survive this bout of blue balls, especially when the object of her desire was so close to her. ''Can't it wait?''

''I'm sorry, I need to see. Please, Rebecca. I'll be quick.''

Abi's voice was panicked. Rebecca couldn't remember if she had ever heard her grandmother like this before. Her heart pained to hear Abi like this. ''Hold on a sec, I've got the door locked.''

Swallowing the lump in her throat, Rebecca shut off the water and stepped out so that she could quickly retrieve a towel. She wrapped it around the lower half of her body. Her boobs were completely exposed. That didn't matter to Rebecca since it was something that she and Abi both shared. However, her concern was what she was trying to hide below and how poorly of a job the towel did in covering her. While her cock was concealed, the obvious bulge made it clear that she was trying to hide her boner. At this point, Rebecca didn't even care anymore. Her nerves were jumbled up enough. She hurried to the door and unlocked it.

As soon as it opened, Abi's eyes travelled up and down in a split second. There was a momentary pause when Abi caught sight of the tent in Rebecca's towel, but she was soon quick to dash inside and immediately turn to her left. ''I'm really sorry, Rebecca. I've looked everywhere and I think that I've left it in here.''

''Left what?'' Rebecca asked.

Abi was trying to reach up to one of the shelves on the bathroom wall where a bunch of small baskets containing the bathroom condiments were lined up. Abi struggled to grab them. Her reach was so agonisingly close. Usually, she would use a stool to help her, but she seemed to be in a hurry.

''Here, let me.'' Rebecca offered and reached up to grab the first basket. Her breath stopped when she felt her towel loosen around her waist. She snapped one arm down to grab the towel before she could reveal anything. Thankfully, she spared Abi the sight of her raging boner. ''I'm bigger…taller than you.''

Abi's breath also seemed to have slowed to a crawl as it became apparent how close the two were standing next to each other. Abi's eyes drifted to Rebecca's wet shoulders, watching the droplets fall and peak over the younger woman's breasts. ''Yes, you are.''

Rebecca felt her cock pulse again and tried to ignore it. She grabbed the basket and gave it to Abi. ''What did you lose?''

''My earrings,'' Abi answered as she searched through the items. ''I always take them off before I shower. And for whatever reason, I forgot to put them back on when I came out. I think that I might have accidentally left them in one of these boxes when I put my shampoo away.''

Her grandmother was frantic. She was trying not to look worried, but Rebecca could see that Abi was hoping with all her heart that she would find those earrings. Now that Rebecca thought about it, she had always seen Abi wearing them. She believed they were just accessory items that added to the older woman's beauty. But, they clearly meant more to her. So, Rebecca started to look as well. With the two of them searching, it didn't take look for Rebecca to spot a faint glint that reflected off the bathroom light. She carefully took them and handed them to Abi.

''Oh, sweetie, you are amazing!'' Abi cheered, grabbing Rebecca's face and kissing her on the cheek.

For a brief moment, Rebecca got her hopes up and expected their lips to touch. When Abi pulled away, the young woman couldn't shake away the feeling of disappointment.

No, she couldn't do this. Boundaries needed to be respected. Rebecca wasn't going to let her fantasies ruin her reality.

She watched as Abi started to put them on and forced a smile. ''Those earrings must be important to you.''

Abi beamed. ''They are. They were given to me by a friend a long time ago. I could never be without them.''

It warmed Rebecca's heart to see Abi so joyful. It almost made her forget about the fact that she really needed a release from the tension she was feeling between her legs. She would have to get rid of it once Abi left and she returned to the shower. Rebecca grabbed the basket and hoisted it onto the shelf. When she glanced down at Abi, she saw her grandmother staring up at her with her head to the side so that she could show off her earrings.

''How do I look?''

Rebecca opened her mouth to think of a witty retort when she felt the basket slip from her grasp. To stop it from falling she would need to use both hands. Without thinking, she pushed the basket back into its rightful place and prevented any of the items from falling on top of them. However, she had another dilemma…the towel had dropped and her erection had sprung free.

Rebecca looked down and saw that her cock was inches away from Abi's face. The older woman was utterly transfixed. For a moment, neither of them could move as they tried to grasp what was happening. Rebecca, both feared and hoped that Abi would grasp something else. They were so close to each other; Rebecca could feel her grandmother's warm breath tickle the tip of her dick. This was the young woman's fantasy come true.

Don't say come! Don't think about cum!

Rebecca felt a rush take hold. She wanted to turn away and stop whatever was about to happen from happening. She couldn't. She was rooted. Her only hope was for Abi to either turn away or rise to her feet. Abi did neither. She stayed exactly where she was. Her eyes were glued onto Rebecca's cock, following every vein around the thick and long shaft. It was still wet from the shower, though the towel had dried it a little. But, it didn't help with Rebecca's aching need. Her balls tensed and Abi's lips parted ever more slightly.

''Abi!'' Rebecca gasped just as she came.

Thick jets of cum blasted onto Abi's face, coating her shocked expression with sticky seed. Rope after rope painted Abi like a canvas. Yet, she still didn't move away. Perhaps, she was too shocked? Either way, Rebecca could only watch on helplessly as she gave her grandmother the messiest facial imaginable. Rebecca palmed the wall and groaned through gritted teeth as the last few strands of her cum covered Abi. Cum trickled down to Abi's chin and over her lips. A sigh slipped out of her mouth as she slowly looked up and locked eyes with Rebecca. Neither said a word. The only sound bouncing off the bathroom walls was that of their heavy breathing. Rebecca didn't know what to say. What could she say?

This was on an entirely new level from everything else that had happened between them before. Where could they go from here?

They couldn't think about it for too long as they heard the doorbell ring.

XXX

HELLO MY SWEET SUPERSTARS! I HOPE THAT YOU LIKED THIS CHAPTER. THIS IS ANOTHER TROPE THAT I LOVE TO WRITE ABOUT. I DON'T KNOW WHY SHOWER SCENES ARE SO GOOD FOR DRAMA AND TENSION AND HOTNESS. WHAT DO YOU THINK WILL HAPPEN NEXT AFTER THAT AWKWARD MOMENT BETWEEN REBECCA AND ABI? WHO IS AT THE DOOR? I LOVE READING YOUR COMMENTS AND REVIEWS. THANK YOU ALL SO MUCH FOR READING.TA-TA FOR NOW.

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