The sunlight passed through the gaps in the cave’s ceiling, landing on Iris. It refracted and traversed across her body, softly illuminating the surrounding and heating her inside. Her mass of slime congregated into a gorgeous lady who donned an exhausted and feeble expression. Though she was even more seductive yet purer than before, her weariness would kill all the mood.

By focusing her intention, her slimy body tensed and formed a smooth curved silhouette, expelling dirt and insects caught in her body. She wished to sleep on the mud bed, covered by the cosy webs, but Lenmia forbade her because of her inability to maintain her bouncy form during her sleep. She would inevitably ruin them.

As soon as she emerged from her puddle, she stretched her body, leaning her chest forwards while bending her head backwards, flicking the laziness out of her hair. Her hands slid across it until she remembered that she had become a Slime Girl, who could easily control every part of her body.

The memory about yesterday came to her, shifting her body hue towards pink. She partially melted as she recalled the training she had undergone. The heated whispers from yesterday still lingered in her ears. She shuddered while her strength left her legs.

"Sister Iris, you look exhausted. Did you have a good night sleep?" Tardi said as she walked towards Iris, who covered her face in embarrassment. Her body radiated a fragile shyness which indicated her conflicted emotions.

"I'm fine, Tardi. Did I oversleep?" Iris surveyed the surrounding, but no one was in the resting part of the cave anymore. "Yesterday was too much for me, especially the kissings."

"It felt good, though, but I understand. My first time also went the same way as yours." Tardi touched her lips and smiled absentmindedly. "Sister, I've heard that the purer you were, the stronger and more beautiful you'll become. I'm a little jealous!"

A flash of image emerged inside Iris's memory. An indecent Slime Girl, modelling her body in such a way that highlighted her silhouette, strolled towards a group of men, who lost their minds under her seductive charm. She coiled her body around them, and with her eyes shining like a pair of gems, she drove herself into the world of pleasure, the like of which not even Monster Girls could resist.

"I hope not. I'm still uncomfortable with this way of living."

"Why? Is it because you want to become lewder and become even stronger? Sis, you're amazing!"

Iris cried, but her tears melted into her body. The moral of this world was incompatible with her standard, which valued purity and fairness. Nevertheless, the nonchalance and carefree attitude of her sisters were fun to follow. After all, they were sisters, so at least it wasn't impure, or so Iris thought.

"I'm not great at all. Compared to Sister Lenmia, there is a lot I have to learn," Iris said and averted her gaze at the mention of Lenmia. "Anyway, how late am I that you have to come to wake me up?"

"Just a little late. Sister Lenmia must've gifted you extra Soul Energy for you to digest," Tardi said and turned towards the cave's wall. She delayed her speech before powering it through. "It's almost noon now."

"Sorry . . ." Iris said and slapped her face lightly, but her hands simply merged into her face before she pulled them out, not feeling any pain except the mental one. "I wasn't always like this. The last night left me dead-tired!"

"Sister Lenmia went overboard because you're too innocent, Sis. You moaned and—"

"Tardi, I'll go practice my control now. See you!" Iris hugged Tardi and squeezed her to stop the ongoing speech before darting out of the room, leaving Tardi alone, confused yet excited by Iris's lingering touch.

"Sis, you're indeed amazing!" Tardi smiled before she went to practice her mud manipulation ability. Maybe she would get some rewards from her sisters if she could surpass her current level and undergo the first phase of Metamorphosis.

...

Iris wandered inside the cave, following a trail of spider webs. As a Monster Girl, her sensory perceptions had increased dramatically, including her night vision and pleasure receptors. As a Slime Girl, Iris could feel every slight graze in her water-like body, giving her a naturally sensitive body and mind.

When she received training from Lenmia, her consciousness would adapt to the sensitivity and naturally adjusted her mindset to accommodate her instinct. Though she feared she would become lascivious, training her body to survive was necessary. The Monster Girl's instinct would never corrupt her mind. She was as pure as could be.

"There you are, Sister Iris," Dulcie said as she emerged from the other side of the cave. She stared at Iris's pinkish body and smirked. "I was wondering if I could practice with you. Yesterday, you were irresistible . . . ."

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"Sis Dulcie, please don't tease me," Iris said while fiddling with her fingers in shame. "I'm trying to find Sister Reta. Sister Lenmia told me to find her when I wanted to practice my ability."

"That's unfortunate, but Reta is busy right now. I also know where the pond is. I can lead you there." The rose on Dulcie bloomed and swayed with her happy voice. She walked to Iris's side and linked their arms together. The flowers and vines of her body perked up, dancing with her little bouncy movement.

"Do we have to walk like this? We might trip and fall," Iris said while holding in her voice. As she walked, her body pressed against Dulcie, whose expression appeared perfectly happy and oblivious to the situation. Her petals and vines pierced the membrane and wiggled inside Iris, who almost moaned.

"Don't worry, Sis. You can fall on top of me. I'll hold you until you melted into me." Dulcie leant her head onto Iris and giggled. Her other arm grabbed Iris's shoulder before she began to snuggle the bouncy membrane. "Please don't mind me, Sis Iris. Your body is so warm that I want to stay inside you."

"Dulcie, I'm uncomfortable. I really am. My body is tingling," Iris said, stuttering as her voice cracked. She increased her pace and rushed through the cave, fumbling her ways to where the cooling air permeated.

Along the way, Iris almost tripped several times, but her control over her slime body helped her. The puddle under her feet emerged upwards and supported her and Dulcie from falling. Despite how Dulcie intentionally tripped and hugged Iris, they never fell against the ground and on top of the other.

To Iris, the short walk was the most miserable yet melting experience she had. Her body quivered from the itchiness which spread itself throughout her slimy mass. Her sight lingered on Dulcie and her flower-covered figure, half-confused and half-drunk. She only regained herself when she had arrived at her destination.

They stood in front of a spacious room in the cave, where a still pond resided in the middle, surrounded by small glowing plants. The light from the neon flowers tainted the brown soil, giving off the listless night atmosphere.

"Sis, your balance and awareness are too good," Dulcie said as she unlinked her arms and pouted. "Why don't you trust me and fall on top of me?"

"Sister, I know what you're thinking. Just because you could trick me last night doesn't mean I'll fall for another."

"Iris, oh Iris . . . I don't know who taught you, but you're too innocent for our world. You should just accept the pleasure. Well, the purer you are, the more corrupted you'll be in the end. At this rate, you might become the next First Seat of the Cardinal Sins."

"Please don't make that assumption! I won't do lewd things with anyone or become like Sister Lenmia." Iris's voice lessened as she began to doubt her words. The acceptance towards immorality slowly ground her rejection. After all, she had already become a Monster Girl, the incarnation of lust. "I won't, ever."

"If you say that, how can I resist?" Dulcie gently hugged Iris and spun towards the pond. They tumbled and fell into the still water, drowning while the chill mixed with their bodies.

The flowers on Dulcie absorbed the water and trembled in ecstasy. She grabbed onto Iris, pulling her melting body inwards and kissing her, drinking the water and saliva which flowed in and out. Iris trembled as her consciousness slipped and scattered across the pond before congregating at her lips, where the soft, sweet tongue coated in flower nectar enticed her.

She struggled, but Dulcie caught her hand and placed it on the flower-covered breasts before dragging it downwards. Amidst the overflowing pleasure, Iris finally stabilized her form. She drew her hand back and shot towards the surface, biting her sweetened lips in panic, tasting the nectar on her tongue.

Her body rose from the surface of the pond, letting out a muffled, lustful moan. Despite the cold temperature of the pond, her body boiled at the thought of what had transpired. She nervously looked around for any bystanders who might have witnessed her dark side.

"Sis, how is it that you get even sexier in just one day?" Dulcie appeared from behind and said. "Did Sis Lenmia give you that much Soul Energy, or do you have a talent?"

"Dulcie, I'll get angry if you do it next time! I almost drown when you—you kiss me!" Iris clenched her hands, feeling slightly better. "And I'm not good at this. Don't ever tell me that I'm talented at these types of actions again."

"Even though your shy pose is this seductive?"

Iris's left arm tensed under her breasts, lightly pushing them upwards, while her right hand placed on her abdomen, pointing at her pelvic yet never quite reached it. The redness in her silhouette unintentionally highlighted her curvature.

"I didn't mean to. It's just a coincidence," Iris said after she realised how naughty she had become. She forced herself to stop her train of thought and retreated from Dulcie. "If you come near me, I'll tell Sister Lenmia you bullied me."

At the mention of Lenmia and her devilish punishment, Dulcie dispelled her teasing attitude. She faked coughing, though her face really turned pinkish. Even her playful nature was not enough to last against Lenmia.

"Elder Sis, please don't be mad. I didn't just play with you. I also gave you a little of my nectar, which could increase your focus. Have you realised that your control over water has increased?"

Iris licked her lips for the phantom sweetness as she blushed. Her ability had improved. She was able to control the dispersion and gathering of her consciousness at will. By focusing, a part of her consciousness drifted into the pond and manipulated its current.

Her sense of self stretched across the pond, feeling every part of it. Nevertheless, she couldn't expand her perception across a long distance, but she was able to feel the edge of the pond as well as every part of Dulcie's submerged body. The delicate, sugary nectar on her body diffused into the water, which Iris could taste as if she were licking it.

"You know this, don't you!" Iris pulled her mind back and shouted. "You tricked me again!"

"But Sis, don't you want more?" Dulcie said and pointed at her lips, slowly rubbing it with her sweetened tongue. "I'm always open for more. It'll feel even better in a prolonged session."

"I'll drown you under this pond, and no one will be able to save you!" Iris said through her gritted teeth and channelled her ability. The pond trembled. Multiple tendrils of water emerged and coiled around Iris.

Dulcie giggled and swam in the water, teasing Iris's senses with all manners of shamelessness. The splashes and shouts and moans resounded throughout the cave.