Case 125: Upon a ‘bonding’ time with the heroine.

I raised a tigeress.

No, she was worse than a tigress. Fierce, yet extremely cunning. Whether it would be acting coquettishly to get what she wanted or subtly luring me into agreeing to some strange things she said... the worst part was, I couldn't even resist her, be it physically or psychologically.

I knew that I was being manipulated. That the heroine was gradually forcing me to recognize her as a woman, not a little sister. If I didn't have this kind of perception, I wouldn't be a high succubus—a species that was adept at detecting human emotions.

There were moments I contemplated rejecting Lyra with everything I had, but... I couldn't bring myself to do it.

''...''

It was just another peaceful night.

Lyra familiarly nested in my embrace to sleep, even though she was bigger than me now. At some point, I subcounsciously hugged her, patting her back like I used to do.

Sensing her steady breaths, her clingy hands, I fell into deep thoughts.

At this point, I would be foolish if I continued to deny it. Lyra... was serious about her feelings toward me. Of course, I still came to the same conclusion—I didn't have a good reason to stop her.

We weren't related by blood. Hell, we weren't even the same race. If Lyra regarded me as a romantic target, then I wouldn't have a ground to denounce her advances. Time and time again, I had to accept that the little heroine was now an adult who could think and make decisions for herself.

As her step-sister, however, I could reject her feelings. I had moral grounds for that. That was my right. No one could force me into a relationship, that was for certain.

But worryingly... even I started to be comfortable with her bold moves. Like my body was actively adapting to accept Lyra despite my mind's hesitance. This... this was my biggest fear.

Was it really right for me to allow this kind of change in our relationship...?

For a long time, I struggled with those questions.

I immediately regretted the consideration I had for this terrible pervert the next morning. The heroine announced that she was free for the day after our breakfast, which triggered a premonition in me. And... it couldn't turn out truer.

''S-Stop! Stop, you pervert! Get away from me...!'' I nearly yelled, floundering as I tried to push Lyra away. ''Is this what you call 'bonding'?! This is just sexual harassment...!''

The shameless heroine, unbothered, continued to rain kisses on my thigh, pressing her lips so forcefully they left vivid marks, ''Don't hold back. Scream louder if you want to.''

She clung to me like a bug, holding me with the conviction of a possessive cat.

I was immensely embarrassed. Since I still wore my thin night gown, she could obviously see everything down there with a flick of her eyes if she buried her head that deep, not to mention her lecherous hands that were caressing all over my legs.

But even her clumsy moves, driven by youthful desires, somehow enticed the succubus in me. I couldn't help but think of the inexperienced Lyra as... adorable. Endearing. Yet ultimately, I was scared. At this rate, if I got too aroused and she saw it down there... I would die of humiliation!

''Hgn...!''

So, I gritted my teeth and endured, clutching the bed sheet with all my might. Whenever Lyra's lips traced a part of my skin, slowly, as if enjoying it, I shuddered at the soft sensations transferred. The metal chains struggled with each jolt of my body.

To the point that I felt my entire self burning, tears welling up at the corners of my eyes.

Eventually, Lyra left her post after having her fill and climbed on top of me, licking her lips gleefully, ''...You seem embarrassed.'' She mused, ''I see. It must have been unfair for you, right?''

''Hah... hah... huh...?''

I then stared wide-eyed as Lyra began to take off her clothes, one by one. Being by her side for so long, I knew just how hesitant she was about showing her body to others.

Yet, here she was, stripping down to her underwear right in front of me, just for me.

The heroine wore laced garments matching the color of her hair, accentuating her body's lean curves and her beautiful overall figure. Slender, but not skinny. Delicate, but not compromising healthiness.

...Unlike my body.

''Y-You...''

I was stunned at the sudden revelation. I could hardly believe the woman in front of me was the same little girl I used to give headpats to. I was... strangely excited.

''Now, it's your turn.'' Lyra narrowed her pretty eyes, her hands reaching forward.

''Ah—''

With a swoosh, my nightgown was tossed to the side, revealing my bare skin, shielded only by a pair of cotton underwear. I instinctively tried to cover myself, but Lyra snatched my wrists before I could act, pinning them above my head.

''W-Wait a minute! Let's talk this out!'' I pleaded, seeing her immaculate face leaning forward. I could sense a scorching willfulness in her eyes, which was definitely dangerous.

''Noisy.''

With that single word, Lyra decisively sealed my lips with hers.

The happiness, the shame, the pleasure, the regret, the acceptance, the unwillingness—all surged up at once, yet under the heroine's passionate presence, I was powerless. Her bare body was pressed against mine, chest to chest, face to face, our lips deeply intertwined.

She held me firmly in place, imprisoning me in her heat, and in my brief struggle that was essentially worthless, I sensed her tongue boldly invading my mouth.

''Mghmp...!''

My body jolted with vigor, yet she didn't budge. I could only lament my futile effort as she made my mouth her own place. And, the worst part was, just like before, I couldn't call my retaliation genuine.

I was... enjoying this.

A sense of self-deprecation arose. While repeatedly blaming myself for being so lecherous, I ceased my movements, letting Lyra do whatever she wanted.

Taking this as some sort of signal, the heroine escalated her assault by another notch. Her free hand crept up to my chest, dug between the squished bra, and began to massage my bare breast.

She really seemed to like this part of me.

''Hng...''

Her motions, initially clumsy, slowly became more practiced and confident, more bold as she felt me aroused by them. She kept kissing me and playing with my chest for a long time, as if not wanting to part even for a moment.

At some point, I instinctively tried to rub my legs together to ease the itch down there, but Lyra immediately intercepted it. Her own leg pressed between my thighs, her eyes sharpened, domineering.

Under her control, I nearly lost my mind. Her pursuit was relentless and fierce, leaving me no room to breathe.

''Hgn... hah... hah...''

When she finally pulled away, I found myself utterly defeated, weakly gasping for air. Lyra looked down on me with an amused gaze, licking the residual saliva on her lips.

A rare blush fell onto her face, and the heroine smirked gleefully as she whispered, ''That felt excellent, Cecilia. I look forward to doing more with you.''