Case 138: When her sister became a lover.

*****

Lyra had returned to the Orleans mansion.

Despite coming back from a long journey, she showed no particular sign of stress or exhaustion. The fights she had been through were certainly tough, though not to the degree that she couldn't tolerate. It was Cecilia's abnormally useful intel that saved her from most of the trouble.

The more Lyra thought about it, the stranger it became. Following Cecilia's lead, the heroine had easily obtained treasures hidden around the capital. Like that of an omniscient god who had seen and comprehended everything, her information was eerily accurate. Of course, Cecilia wasn't a god, nor was she omniscient. But it begged a question—

'Who exactly is she?'

Lyra had a hunch—Cecilia's identity was far more special than she had initially thought, even beyond her succubus bloodline or her demon crown. Cecilia... still had something to hide.

Nonetheless, it didn't matter much to the current Lyra. As long as that foolish woman's feelings were real, it was enough. As long as her soul and body belonged to Lyra, it was enough. Cecilia was always her world, and it would remain that way no matter what happened.

'She's still being stubborn, but soon enough, she'll have to accept me.'

Lyra was confident. Objectively speaking, her charms were not inferior to those of Cecilia's lovers. Perhaps because of her natural receiver personality, but her crush was especially weak to direct displays of affection. And at this point, after establishing a firm grasp on Cecilia's freedom, Lyra felt she had all the chances in the world to get to her heart.

Today, too, was a good day for progress.

'I wonder how far I can push now.'

After finishing dinner and a bath, Lyra held that thought excitedly and headed to Cecilia's room. The heroine was prepared for a warm welcome, then a cautious retreat when faced with romantic affection. Those contradictory actions were what made it fun every time. Lyra wouldn't call herself a predator or make similarly cringy metaphors, but Cecilia really did look like an adorable kitten in her arms—easy to pick on.

''W-Welcome back.''

''...?''

Yet, as Lyra opened the door, she was met with a slightly different atmosphere.

Cecilia sat on the edge of the bed, seeming somewhat nervous but weirdly bold. She no longer hid her horns and tail like she usually did, and her silky hair that pooled on the sheet was a natural ashen gray color.

The heroine felt her heart beating faster. She closed the door and approached her target, hoping to hide her wavering.

''Was it lonely?''

Thankfully, Lyra's voice came out even as she reached for Cecilia's cheek. But... the usual avoidance was nowhere to be seen. The woman with trembling red eyes calmly accepted the heroine's touch, even nuzzling at her palm.

Lyra gulped. She couldn't believe it.

So, she leaned in for a kiss, her hand unconsciously tensing up. This time, instead of having to chase Cecilia's lips, that softness came to her on its own.

''Mhm...''

The succubus princess kissed Lyra voluntarily, even wrapping her arms around the heroine's neck. The whip-like tail shyly coiled around Lyra's wrist, its heart-shaped tip tracing the spotless skin.

''...''

Afterward, it was Lyra who got stunned. The woman before her eyes almost seemed fake. On instinct, she tried to retreat, but the tail refused to let her escape its grip. Her hand was caught, and Cecilia, dragging the chain, raised her own hand to pull Lyra in.

In an instant, the heroine's senses were overwhelmed with a seductive presence. Her head rested on Cecilia's ample chest, which was barely clothed. Her touch fell onto Cecilia's full thighs as their bodies were pressed against one another.

''I was... waiting for you,'' Cecilia admitted, her voice small and coquettish. ''I missed you.''

Lyra, her mind wandering, couldn't respond for a while.

Then, it all snapped.

The heroine simply couldn't resist it anymore. She rose, pushed Cecilia down, pinning both her wrists to the bed. Once again, hardly any resistance could be felt, only a nervous acceptance, which made Lyra feel as though her body was on fire.

''Mhmp...!''

Cecilia was kissed forcefully, her space ravenously devoured, yet she didn't cower, embracing even the roughest part of Lyra's desires.

The heroine pounced relentlessly, her previous restraint gone. She rained kisses down Cecilia's neck, down her shoulders, her delicate collarbones, then her heaving chest, which had been greedily played on by Lyra's own hands.

At the end of it, Cecilia's upper body was left ravaged, left without a shred of fabric covering her skin.

''Hah... hah...''

''Ngh...''

Lyra sat on the woman's lap, panting, while only weak whimpers could be heard below.

''You... how did you become like this?'' The heroine uttered. ''Speak.''

''...I thought it was unfair for you.'' The succubus replied.

''...What?''

''I... I never looked at you properly as a woman. I didn't even try to. So... now I'm trying to. I'm trying to treat you... not as my little sister, but as a woman.''

Lyra couldn't define the emotion in her heart. It felt baffling, definitely unexpected, but perhaps quite... nice. Spotting a grin, she pried away Cecilia's wrist that was hiding her crimson eyes, then teased, ''So you'd be such a slut if I wasn't your sister?''

''D-Don't say it like that...''

''But are you attracted to me? Say it.''

''...I do.''

A sea of flowers bloomed in Lyra's heart. She had been certain of this fool's feelings, yet hearing such an affirmation was drastically different. In a good way, of course. It felt like all her efforts had finally paid off. All her studies, her hours grinding magic, her patient build-ups of affection...

''Hah...''

''Eek...?!''

Lyra buried her face in Cecilia's chest, eliciting a jolt. Even that instinctive reaction brightened Lyra's mood significantly now. But that wasn't the end of the pleasure. Soon, the heroine felt her head being stroked—so gently, like feathers brushing against her hair.

Even at this moment... Cecilia never hesitated to show her care. This was the reason Lyra fell in love in the first place.

The two remained that way for a dozen minutes, hugging one another affectionately. The boundaries, which had been pushed solely by Lyra until now, were starting to look even blurrier.

After all, no sisters kissed and hugged nakedly like this.

If she had a piece of genitalia like Cecilia's lovers had, she would have definitely messed up her body tonight—Lyra thought. It was rather unfortunate... but even if she couldn't fill Cecilia's belly with love, she could still have sex with her, right?

Suddenly, a dangerous glint flicked in the heroine's dark eyes.

''...Lyra?''

And Cecilia, being able to sense emotions, quickly caught on to this change. Her body shuddered under the sheer desire Lyra had for her, but she couldn't blame anyone other than herself.

She had brought this onto herself.

At this point, there was no option but to submit and obediently accept it.

''Um... please go easy on me?''