"Um... well... Senior Sister Feyn..." I stammered, flustered and incoherent. In my panic, I even blurted out "Senior Sister."

Senior Sister Feyn unfastened her lower skirt-like armor and set it on the ground, revealing the black stockings underneath with her white shirt tucked in—a signature senior sister look.

Hands on her hips, she reached in to grasp the edge, then looked up with mild surprise. "What did you call me? Who are you, really?"

"Huh?" I quickly denied it. "I-I'm Dark Princess Kuroti, of course! I heard Senior Sister Feyn's name from intelligence."

"Oh," she replied casually, continuing to undress. "Hurry up and take yours off too."

I kept fidgeting shyly. Her outfit was complex, so she undressed leisurely, ignoring me. My gaze darted away, unsure where to land on this tall, mature girl stripping down.

Huh??? Huh??? No way! Not just the white shirt—even the st-stocking... stockings came off???

No, Senior Sister, you can't do this! What are you even trying to do?

Yet she showed no sign of stopping, only a faint, unintentional blush on her face.

Maybe changing with another girl is normal... but Senior Sister, do you know my true identity?

The next moment, I felt her approach. Slender fingers turned my face up gently. Before I could focus, a moist, scorching sensation pressed against my cool lips.

That wet, hot, impossibly soft thing claiming my lips—was it Senior Sister's?

I... was kissed?

Her movements were unexpectedly natural and skilled, stealing my first kiss as easily as eating jelly.

"Mmm... nngh..." Dizziness forced my eyes shut. Under her lips' invasion, I whimpered incoherently.

Why—when she's so pure, aloof, righteous—why are her moves with girls so practiced?

I can't handle an experienced, gorgeous senior sister like this...

Time blurred. Minutes? Hours? To my dazed mind, it didn't matter. If she wanted, she could kiss forever—or go further...

When her lips left mine, the sudden emptiness made me feel oddly lost.

She pressed slender fingers to my lips, breathing a warm, sweet scent. "Call me Feyn now. Only cute girls I've kissed earn that right."

Feyn... Can I really call her by name now? Is this a reward? Or a forbidden bond that intoxicates and shames? I... don't know.

She released me, then put on the Fallen Lady Angel armor stripped from me—piece by piece. All I saw was a blurry figure.

I slumped weakly in the corner, legs kneeling sideways on my cloak. A crystal trickle dripped from my lip—hers or mine? Mixed together, indistinguishable...

Feyn finished donning the armor—magical gear that adjusted to her form. If I weren't so dazed, I'd have nosebleed from her current look.

Feyn Senior bent down, picked up her oversized bra and tiny panties, and tossed them at me. "They won't fit well. Wear them anyway," she said, voice teasing yet tender.

Then Feyn grabbed her longsword, slipped out carefully. Outside, gasps erupted—but *slam*—she shut the door from beyond.

Only I remained, hazy-eyed, leaning weakly against the wall.