Sinful Guilt
Hesitation only struck right on the brink of committing the sin.
The moment I boldly confessed my feelings and pressed my glans against the soft, trembling entrance—it all came flooding back, those memories I'd desperately tried to bury.
The sisters chasing off a dog that bit me by throwing stones. The time I fell from a tree playing elevator with my Porter Aptitude and they flew into a rage like a pair of furious mothers. The way they'd come back from helping in the village, their faces caked in dirt, grinning ear to ear as they fed me bites of roasted potatoes, bragging about all the snacks they'd scored. And that night they searched for me tirelessly when I got lost on the mountain, sobbing as they hugged me tight when I followed their lantern light straight to them.
It felt like I'd suddenly gained big sisters who never existed. Every time I called them "sisters," it was laced with genuine respect.
Now, the realization hit me like a gut punch: I was about to have sex with her—no holds barred. The line I'd desperately clung to, treating her like family and nothing more, was about to shatter as our mucous membranes rubbed together. The guilt lodged in my throat like a foreign object, choking off my words.
"H-heh... ugh. T-Tan...!"
But my body reacted honestly to the pleasure. My cock, brushing her slick entrance, sank slowly into her depths as if being swallowed whole.
Her eyes glazed over, her expression crumbling into a mess. Both of us were gasping under the suffocating stimulation.
"S-slowly... just a bit...!"
The tight but yielding walls of her pussy flinched at the unfamiliar pain. But soon, they relaxed, leaving only a faint resistance. Like a mother's boundless acceptance, ignoring the ache of her first time, her walls took me to the hilt. Then they molded tightly around my shape.
This is it.
In truth, I'd dreamed of doing this with her dozens of times. Hundreds, even, in those taboo fantasies—imagining the moment I'd cum wrapped in her flesh.
And unfortunately, that first release was coming far too soon. No time to savor the fantasy made real.
Yeah. Better to get it over with quick. She said completing the ritual was the only way to break this crisis.
"Sis—...ters."
"Don't... hn, call me 'sisters' right now...!"
Her ample breasts mashed against my chest as Monica whispered. Her voice, soaked as her belly, stuttered with gasps.
"Just this once, don't keep that distance. No titles between us. Call me Monica. Monica."
Her body burned like fire. Her pussy felt like dozens of tongues wrapping my cock. Too much to contain—it leaked obscenely from where we joined.
"Gonna... cum."
"Call me Monica."
"Gonna cum, Monica...!"
Like my glans was being teased for the first time, the stimulation pushed past my limits. I couldn't even thrust—my cock just twitched helplessly as her walls writhed around it like a lollipop.
"Do it."
"Mon... ica...!"
"Pour it all in. As much as you wanted... to hold me back then."
Her clenched legs pinned my waist with her heels. No escape.
My orgasm hit—not like cresting a wave of ecstasy, but sudden and explosive, like a busted valve.
"Hngh, haa, hup...!"
"So this is what it feels like..."
Monica trembled, her face alight with bliss. The intense scent and heat choking me started to cool. Exhaustion sapped my strength—I had to fight not to collapse on her.
I poured my seed into her alongside the guilt, pulsing as it spilled out.
"Monica...!"
Five times. Ten. Fifteen. The twentieth contraction. My abs ached, but it wouldn't stop.
Something was wrong. I realized it then.
"...Monica-sis?"
"I told you to call me by name."
As I tried to pull back on shaky hips, a pale purple tail coiled around my waist. Monica dragged me back into the mire, whispering:
"Like you did with Esen."
Meanwhile, on the third floor.
[What the—?!]
Sudden change swept through. Invisible, but everyone felt it on their skin. The air warmed. The heavy, humid pressure vanished like it'd been washed away.
The fighters blinked in confusion at each other. But none were as rattled as the succubi.
[We can't get near that building—!]
They fell mid-climb, bounced back mid-charge. A faint pink glow traced the outer walls. The incubi recoiled in fear.
[It's... absorbing yin energy?]
[What the hell did that bitch do—?!]
"It's Monica-unnie and Tan's ritual."
Esen wiped sweat from her brow, eyes gleaming. Monica and Tan had done it. The battle, which seemed hopelessly against them, finally tipped in their favor.
"Hold the line with your lives! If we protect it, we win! Unnie found a way!"
"B-but we can't even approach. If those demons can't get close, aren't we safe now?"
"You think so?"
Esen pointed into the distance. Florica's jaw dropped.
The succubi were clever. And prepared. Catapults—god knows where they got them—rumbled into position.
"Almost there! Once the ritual's done, we can drive them off! Everyone, hang in—!"
Esen's triumphant shout cut short. She'd caught a sound no one else did.
In the eerily silent fourth floor, a faint scream echoed.
"...Tan?"
The being who'd been called Monica her whole life thought: It's all wrong now. I can't hold back anymore. It's beyond what I imagined.
His youthful, fresh, vital essence—far more refreshing than she'd dreamed. It quenched the lifelong thirst and loneliness, satisfying her soul completely.
The resolve not to bare her deepest depths crumbled.
No impulse had ever been this fierce. She couldn't suppress her nature anymore. Not with a lifetime of patience and kindness.
"Truth is, Tan. The day you came back from your mission with Esen."
"Guh... ugh...?"
"I already smelled it. So thick I couldn't ignore it. I knew from the start. You two... had grasped a happiness I could never have."
Tan had responded to her invitation with all his heart. Monica was overjoyed. And furious.
Because she couldn't truly have it all.
"Two lovers tangled slick and sticky, sniffing each other's scents on their bodies. Realizing you'd been stolen by Esen—that bright, energetic girl. You're my first, but I'm not yours."
The boy she'd renounced for fear of ruining him, or shattering their familial love. Knowing someone had claimed him so casually—despair crashed in.
Esen strutted proudly, head high. As if it was natural for man and woman to feel attraction and tumble into bed overnight.
It hurt too much to bear. Because Monica, born not quite human, could never have that.
She'd tried to ignore it. But her keen senses kept digging at her heart. Every encounter, she instinctively read the traces of their passion.
If she hadn't been able to sense their love from the start, it wouldn't have tormented her this much.
"My heart and belly burned. I couldn't stay still. So when you two tangled again in Esen's cabin... I collapsed right outside the door. Peeking through the crack, watching endlessly."
"Wait, stop, Mon... ica...!"
"Wallowing in regret and defeat, tormented by what I couldn't have. Stealing your moans like a thief. Quenching this thirst alone."
"For real... just a sec...!"
"And just a few minutes in, you're whining? Do you know how much I suffered?"
Now it was Monica's turn to bare her soul. She slowly rocked her hips over his over-squeezed, quivering cock. Finding the position to maximize his pleasure. Expert, despite it being their first time.
Like a predator instinctively targeting prey's throat, snapping the bone for the kill.
Monica realized she was born a hunter.
Unleashed, Tan's cock wouldn't stop spewing life force. His face paled like a hemorrhage victim.
The usual Monica would've paled too, checking on him first. Holding, soothing, tearfully asking where it hurt.
But instinct-dominated Monica couldn't stop. The only way to halt her mad ecstasy: Tan dying under her.
In his fading eyes, she saw a lecherous pink demon. The reflection wept. Because her uncontrollable nature was killing him.
"Sis... ters."
His cracked lips twitched.
"Mon... ica, sis... ters."
"I'm sorry."
Even as she slammed her hips in rapture, a faint guilt made her whimper excuses.
"Sorry, Tan. I, I—"
"What... should we eat after?"
"...Huh?"
His hand wiped the tears from her cheek. Then he hugged her thighs and waist tight. Gently, tenderly lifting her.
"Cake... ngh, you like that, right."
Her dominating press shifted to him sitting comfortably, cradling her. Like tender lovers facing each other, fucking slow.
"When we get back... not emergency rations. Real rye cake. Wanna try some?"