As the warm water cascaded down their bodies, Mukuro Ikusaba couldn't help but steal glances at Junko Enoshima, her sister and the ultimate despair. They stood under the showerhead, the steam enveloping them in a sensual mist. Mukuro's heart raced with anticipation, her pulse pounding in her ears. She had been wanting to confess her feelings to Junko for what felt like an eternity.

Junko, oblivious to Mukuro's gaze, closed her eyes and tilted her head back, letting the water wash over her face. Her full lips parted, and a soft sigh escaped, sending a shiver down Mukuro's spine. Mukuro's hands itched to touch her, to explore every curve and contour of her sister's body.

"Mukuro, what's wrong?" Junko asked, her eyes snapping open, her voice husky from the steam.

Mukuro's cheeks flushed, and she looked away, trying to compose herself. "N-nothing, Junko. Just enjoying the shower."

Junko raised an eyebrow, her gaze piercing. "Don't lie to me, Mukuro. I know you too well."

Mukuro's nipples hardened, and her pussy throbbed in response to Junko's intense stare. She knew she was caught, but she couldn't help herself. She took a deep breath and reached out, her hand brushing against Junko's hip.

"Junko, I have something to tell you," Mukuro whispered, her voice trembling.

Junko's eyes narrowed, but she didn't move away. "What is it, Mukuro?"

Mukuro's heart was in her throat as she confessed, "I've had feelings for you, Junko. Romantic feelings. I can't deny it anymore."

The silence that followed was deafening, the only sound the patter of the water. Junko's expression was unreadable, and Mukuro's anxiety skyrocketed. Had she made a mistake?

But then, Junko's face transformed, her eyes sparkling with mischief. "Oh, Mukuro. I've been waiting for you to admit it."

Without another word, Junko grasped Mukuro's wrist, pulling her into a searing kiss. Their lips collided, tongues entwining as they devoured each other. The showerhead pounded against their skin, the sound intensifying their passion.

Mukuro's hands roamed Junko's body, exploring every inch of her sister's skin. She couldn't get enough of Junko's curves, her touch igniting a fire that threatened to consume them both. Junko's fingers dug into Mukuro's hips, pulling her closer as they kissed and kissed and kissed.

As the water continued to cascade down, Junko spun Mukuro around, pressing her against the tiles. Mukuro's breasts were crushed against the cool surface, her nipples screaming for attention. Junko's hands slid down her back, cupping her ass, and pulling her into a fierce, possessive kiss.

With a growl, Junko lifted Mukuro up, and Mukuro wrapped her legs around Junko's waist. Junko's fingers danced across her pussy, teasing her clit, making Mukuro whimper with need. Junko's tongue plunged into Mukuro's mouth, mimicking the motion of her fingers.

"Fuck, Junko," Mukuro moaned, her orgasm building.

Junko's response was a dirty laugh, her teeth nipping at Mukuro's lips. "Hold on, sister."

And with that, Junko slammed Mukuro against the tiles, her other fingers slipping inside Mukuro's pussy with one forceful thrust. Mukuro's cry of pleasure was lost in the sound of the shower, her body shuddering as Junko pounded into her.

The water pounded against their skin, the steam enveloping them in a sensual cocoon. Junko's fingers dug into Mukuro's hips, pulling her into each thrust. Mukuro's pussy clenched around Junko's other hand, her orgasm ripping through her like a tidal wave.

As they orgasmed together, their screams echoing off the tiles, Mukuro knew she was hooked. She was Junko's, body and soul. And as they stood there, panting and trembling, Mukuro realized that this was only the beginning of their twisted, incestuous affair.