Chapter 124: Succubus (R18)

The soft afterglow from Yerin’s borrowed-gown scene still lingered when Yoona stretched like a satisfied cat and rose from the bed.

The faint Succubus glow in her eyes had not faded. If anything, it had deepened. She walked toward the floor-to-ceiling windows that opened onto the private balcony, the city lights glittering far below. The sheer black stockings still clung to her legs; she hadn’t bothered removing them.

She glanced back over her shoulder, voice low and inviting.

"Come here, Seth."

I followed. The moment I reached her, she turned and kissed me, deeper, hungrier than before. Her tongue slid against mine with deliberate heat. When she pulled back, a soft, pleased sound left her throat.

"I’ve been patient," she murmured. "Watching you with Val... watching you with my sister while she wore my clothes. It fed me well. But now I want more."

A subtle shift ran through her body. Her irises brightened to a richer violet. Small, elegant black horns curved upward from her temples, smooth and warm to the touch. A long, sinuous tail uncoiled from the base of her spine, the tip flicking once before curling loosely around my calf. Her presence thickened, warm, intoxicating, the air itself tasting faintly of desire.

Yerin sat up on the bed, eyes wide with open fascination. "Unnie... full form already?"

"I felt like showing off," Yoona answered without looking away from me. "And I want him to use all of it."

Val remained quiet but attentive, resting against the headboard, watching with that calm, approving focus of hers.

I reached up and closed my fingers around one of the horns. Yoona’s breath hitched sharply.

"Ah—"

The sound was soft, surprised, and immediately needy. I tightened my grip just enough to tilt her head back.

"These are mine to hold tonight," I said. "Same with the tail."

Her tail tightened around my leg in answer. "Yes... please."

I walked her backward until her spine met the cool glass of the balcony door. The night air leaked through the seams, cool against our heated skin. I kept one hand on her horn and used the other to push her thighs apart. The stockings framed everything perfectly. When I slid two fingers into her she was already dripping, inner walls fluttering around the intrusion.

"Nnh... Seth..."

I curled my fingers and watched her lashes flutter. Behind us I heard Yerin leave the bed. A moment later she pressed against Yoona’s side, kissing along her twin’s neck while her hand cupped one full breast, thumb brushing the tightened nipple.

"You’re so wet already, Unnie," Yerin whispered. "Did watching me in your gown do this?"

Yoona’s answering moan was low and honest. "It did. And watching him take Val earlier... and knowing you’re both still here to see me get ruined..."

Val rose as well and came to Yoona’s other side. She didn’t speak much; she simply leaned in and claimed Yoona’s mouth in a slow, thorough kiss while her hand slid down to join mine between Yoona’s thighs. Two sets of fingers worked her open. Yoona’s hips jerked.

"Ah—ah—both of you—nngh—"

I withdrew my hand, brought the slick fingers to Val’s lips, and watched her clean them without hesitation. Then I turned Yoona to face the glass, chest pressed to the cool surface, horns and tail fully available. I gripped the base of her tail firmly. The reaction was instant, a full-body shiver and a broken little cry.

"Haaah...! Careful with that—"

"No," I said, and guided the head of my cock to her entrance. I pushed in with one steady thrust, burying myself to the hilt while still holding her tail.

Yoona’s forehead dropped against the glass. "Fuuuck... so deep already—"

I set a hard, deliberate rhythm, using the grip on her tail to pull her back onto every thrust. The wet sound of skin meeting skin filled the quiet suite. Yerin dropped to her knees in front of her sister, still partially dressed, and leaned in to lick and suck at Yoona’s clit while I fucked her. Val stayed close, kissing Yoona’s shoulders and horns, whispering soft praise against her skin.

"You’re taking him so well," Val murmured. "Even in this form."

Yoona’s voice fractured between moans. "Ah—Yerin’s mouth—Seth’s cock—nngh—don’t stop either of you—"

I changed the angle, driving upward so that every stroke dragged against the front wall of her. Her tail thrashed in my grip; I held it tighter. The Succubus energy around her pulsed stronger, feeding on the shared pleasure and feeding it back into all of us until every sensation felt sharper.

After several long minutes I pulled out. Yoona made a soft sound of protest.

"Turn around and get on your knees," I told her.

She obeyed, sinking down onto the thick rug near the windows. The horns caught the low light. I stepped in front of her and guided my cock between her lips. She took me eagerly, tongue working, the occasional soft gag when I pressed deeper.

Yerin and Val knelt on either side of her, kissing along her horns, her cheeks, her shoulders, soft affection while their hands stroked her breasts and the base of her tail.

When I pulled free of her mouth, a thin string of saliva connected us for a second. Yoona looked up, eyes glowing, lips shiny.

"I want you to surprise me," she said quietly. "I know that look. You’re planning something."

I smiled and guided her onto all fours again, this time facing the open balcony door so the night air brushed her skin. Yerin slid underneath her in a sixty-nine position, mouth already working between Yoona’s thighs. Val knelt beside them, one hand stroking Yerin’s hair, the other teasing Yoona’s nipples.

I settled behind Yoona, stroked myself once through her abundant slick, then pressed the head of my cock upper, against the tight, untouched ring of her ass.

Yoona’s entire body went still for a heartbeat.

"Seth—?"

I pushed forward slowly but without stopping. The tight heat resisted, then gave. Inch by inch I sank into her ass while she gasped and trembled.

"Ahhhnn—! Wait—ah—it’s—nngh—so tight—"

"Breathe," I ordered, voice low and steady. I kept one hand on her hip and the other wrapped firmly around the base of her tail. "You can take it."

A long, broken moan spilled out of her as I bottomed out. "Fuuuuck... you actually—ah—did it—"

Yerin’s muffled voice rose from below. "She’s clenching so hard around my tongue... Unnie, you really like this, don’t you?"

Yoona’s answer was half laugh, half sob of pleasure. "I do—I really do—nngh—move, Seth—please—"

I began to thrust, slow at first, letting her adjust, then deeper and firmer once the tension in her shoulders eased. Every time I pulled on her tail she pushed back to meet me. The dual sensations of the tight heat around my cock and the soft, wet sounds of Yerin eating her out made Yoona shake.

"Ah—ah—harder—use the horns—please—"

I reached forward, tangled both hands in her hair and horns, and used the grip to pull her back onto every thrust. The change in leverage let me fuck her ass with short, powerful strokes. Yoona’s voice rose in pitch, raw and unrestrained.

"Yes—yes—just like that—don’t you dare stop—ahhh—"

Val leaned in and kissed her deeply, swallowing the next moan. When she pulled back she spoke against Yoona’s lips. "You look beautiful like this. Completely open for him."

Yerin’s hands gripped Yoona’s thighs harder. "She’s getting close. I can feel it."

I felt it too, the rhythmic flutter and clench around my cock. I tightened my hold on her horns and drove in deeper.

"Come while I’m in your ass," I told her. "Let them watch."

Yoona shattered with a long, trembling cry that echoed against the glass. "Seth—ahhhnn—!" Her whole body convulsed; the tight ring of muscle milked me in strong pulses. The sight and sensation dragged me over the edge with her. I buried myself to the hilt and came hard, flooding her ass in thick, hot spurts while she kept shaking underneath me.

I stayed deep until the last throb faded, then slowly withdrew. A soft trickle of release followed. Yoona collapsed forward onto Yerin with a breathless, satisfied laugh.

"You absolute bastard," she managed, voice hoarse but full of warmth. "Surprising me like that... and using the horns and tail the whole time..."

I ran a hand down her spine, then over the still-stockinged thigh. "You loved every second."

"I did." She turned her head enough to look at me, eyes still glowing faintly. "Next time I might ask for it properly. Or maybe I’ll make you work for the surprise again."

Yerin wriggled out from underneath, lips shiny, and kissed her sister’s shoulder. "You’re so messy right now, Unnie. It’s kind of hot."

Val offered a small towel and a quiet smile. "I’ll get water."

I helped Yoona up and guided her back toward the bed. She leaned heavily against me, tail loosely curled around my wrist, horns still present. The four of us settled once more in a warm tangle, silk sheets, sheer nylon, the faint scent of sex and night air drifting in from the open balcony door.

Yoona rested her head on my chest and spoke softly, almost to herself.

"I think I could stay in this form a little longer tonight... if you want to use the horns again later."

I kissed the top of one horn. "Count on it."