Chapter 10: Sullyoon’s Pre-Debut Extension Endurance Assessment
FBIA: Daily Protocol
By Jaewon
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The sealed envelope from the FBIA Decisions Bureau arrived at 7:15 AM. Director Park’s refined handwriting specified the day’s case: *Sullyoon (NMIXX) – Level 3 Comprehensive Pre-Debut Extension Endurance Assessment. Emphasis on full-body sensitivity calibration, pelvic depth resilience, and multi-tool self-stimulation response due to upcoming extended promotions and high-visual concepts. Senior Inspector Park Gunwoo assigned. Agent Kang and Agent Lee to assist with positioning, lubrication support, and detailed physiological logging. Enhanced self-stimulation tools authorized.*
Senior Inspector Park Gunwoo studied the file carefully in the preparation room. Sullyoon’s ethereal visuals and graceful stage presence required a uniquely calibrated evaluation to ensure she could sustain the physical and visual demands of NMIXX’s expanding schedule. The FBIA’s hidden wing remained impeccably prepared—soft golden lighting casting gentle shadows, air warmed to body temperature, and every surface sanitized for the day’s intensive work.
Agent Kang arrived with his characteristic disciplined stride. “All specialized equipment sterilized and calibrated, Inspector. The larger medical-grade dildo and multi-speed vibrator are prepared alongside the standard warming oils.”
Agent Lee entered shortly after, his sharp eyes focused on his tablet. “Miss Sullyoon has checked in. She has reviewed the extended protocol and expressed understanding of the enhanced self-stimulation segment. She seems composed but quietly anticipatory.”
Park Gunwoo set the file aside. “We adapt the mapping sequence today for deeper calibration. Reconfirm consent at every transition. Escort her in.”
Sullyoon stepped into the examination suite with quiet elegance. The NMIXX member’s long, silky hair framed her delicate, doll-like features. She held the white robe closed, her large, expressive eyes taking in the room with a blend of poise and subtle vulnerability.
“Inspector Park Gunwoo, Agent Kang, Agent Lee,” she greeted softly, bowing with refined grace. “I’m here for the endurance assessment. The upcoming promotions are more demanding than before, and I want to make sure I’m completely ready.”
Park Gunwoo met her gaze with steady reassurance. “Your safety and optimal performance are our priority, Sullyoon. The Bureau has authorized a full Level 3 protocol with enhanced self-stimulation tools for comprehensive pelvic and sensitivity calibration. We will perform complete sensory mapping with fingers and tongue across every area while you use the provided devices. Adjustments are always possible. Do you consent to the entire extended protocol?”
Sullyoon paused briefly, then nodded with quiet resolve. “I consent fully.”
“Very well. Disrobe at your comfort and lie face up on the table.”
She allowed the robe to slip away, revealing her strikingly beautiful, slender-yet-feminine figure: gracefully full breasts with delicate rosy nipples, a softly toned waist, gently flared hips, long lithe legs, a perfectly smooth shaved mound, and dainty, elegant feet. Her skin had an almost luminous quality under the warm lights.
Park Gunwoo began with an extended visual assessment, noting the subtle play of light across her form as Agent Lee recorded observations. “Exceptional skin luminosity. Natural flexibility high, with focus areas in the pelvic region and inner thighs.”
He started palpation at her wrists and arms, working upward in a fresh sequence to calibrate peripheral sensitivity first. Fingers pressed along her forearms and upper arms, identifying minor tension points. Agent Kang provided light counter-pressure for accuracy. Park Gunwoo then shifted to sensory mapping, lifting her arms to lick slowly along the undersides and into both armpits with broad, exploratory strokes, savoring the unique warmth and subtle scent of her freshly prepared skin. Sullyoon’s breath hitched sharply at the intimate contact.
Moving to her upper torso, he cupped her breasts with both hands, massaging in slow, spiraling patterns to assess tissue depth and responsiveness. His tongue traced intricate patterns beneath each breast before focusing on the nipples — alternating between gentle flicking and deeper suction. Sullyoon’s soft gasps filled the room as her body responded with increasing sensitivity.
The inspection progressed to her back after a smooth assisted turn by Agent Kang. Park Gunwoo’s fingers traced the length of her spine in reverse — starting from the lower back upward — while his tongue followed with varied pressure, sometimes light feather-like licks, other times firmer drags that left faint glistening trails. Agent Lee applied a new blend of oil designed for prolonged sessions, allowing smoother, warmer glides across her skin.
After completing the back and side flanks with heightened attention to her ribcage and waist curves, Park Gunwoo had her return to a supine position. “Transitioning to the core lower body calibration. Consent check.”
“I consent,” Sullyoon whispered, her voice already laced with arousal.
Park Gunwoo positioned himself at the foot of the table. He gently spread her long legs wide. Agent Kang supported one thigh with a firm, elevated hold for maximum exposure. Park Gunwoo’s fingers parted her folds with meticulous care, exploring the outer and inner labia, circling her clit, and testing shallow internal sensitivity. His tongue joined in a slow, mapping rhythm — tracing every contour, dipping and retreating, building her arousal methodically.
For the Bureau-authorized enhanced self-stimulation segment, Park Gunwoo introduced the tools. “We now implement the multi-tool calibration. Use the vibrator on your clit and the massive dildo for internal depth testing while I continue full-body licking and checks. This measures layered endurance and response integration. Agent Lee will assist with lubrication. Full consent for this phase?”
Sullyoon’s cheeks burned with a deep flush, but she nodded. “Yes… I consent.”
Agent Lee handed her the devices after generous lubrication. Sullyoon activated the vibrator, pressing the buzzing head against her clit while slowly working the thick, massive dildo into herself. The size stretched her visibly as she adjusted, a deep moan escaping her lips. Park Gunwoo immediately resumed his mapping — licking along her inner thighs, across her lower abdomen, up to her breasts, and back down while she began thrusting the dildo in controlled, deepening strokes.
The combination created an overwhelming symphony of sensations. The vibrator hummed steadily against her clit as the massive dildo stretched and filled her with each thrust. Park Gunwoo’s tongue never stopped moving — licking the sensitive crease where thigh met torso, circling her navel, sucking on her nipples, and returning to lick around the base of the dildo and her stretched entrance. Sullyoon’s hips rocked, her free hand gripping the table as the intensity built layer by layer.
Agent Kang maintained his supportive hold, voice low and steady. “Breathe through it. Let the calibration progress naturally.”
Sullyoon’s movements grew more urgent. The massive dildo plunged deeper with each thrust while the vibrator pressed firmly. Park Gunwoo licked relentlessly across her body — shoulders, breasts, stomach, thighs — heightening every nerve ending. Her moans turned into cries as the peak approached.
“Inspector… it’s building so deep—!”
Her body arched violently as the orgasm crashed through her. Sullyoon squirted forcefully around the massive dildo in powerful, repeated gushes that soaked the table and Park Gunwoo’s chin. She kept thrusting through the climax, drawing out the intense waves until she collapsed back, trembling and gasping for air. The vibrator continued buzzing until she switched it off with shaky fingers.
The team allowed an extended recovery period with warm cloths, hydration, and gentle massage to her overstimulated muscles. Agent Lee updated the detailed logs. The session then proceeded to the posterior lower body with fresh focus.
Repositioned onto her stomach with coordinated support, Sullyoon received thorough attention to her ass — deep kneading of the cheeks, spreading, and slow, probing tongue work along her cleft and tight hole. Park Gunwoo licked down the backs of her long legs, paying special attention to the sensitive areas behind her knees and calves. Finally, her dainty feet underwent complete mapping — each toe sucked and licked individually, arches and soles receiving firm, massaging strokes of his tongue.
The entire extended session spanned almost three hours and twenty minutes. Sullyoon lay on the table, skin glowing with oil and the evidence of multiple intense releases, every inch of her body having undergone unique, non-repetitive calibration.
Park Gunwoo helped her sit up, draping a fresh robe around her shoulders and offering water. “Superior endurance results, Sullyoon. The multi-tool self-stimulation confirmed exceptional depth resilience and sensitivity integration. The squirting response and overall recovery markers are excellent. You’re cleared with strong recommendations for your extended promotions.”
Sullyoon looked at him with soft, deeply satisfied eyes, still catching her breath. “Thank you, Inspector Park Gunwoo… and the team. That was beyond anything I expected — the tools, the constant licking everywhere… I feel completely recalibrated. Ready for everything ahead.”
Agent Kang offered a rare, brief smile of approval. “All phases completed to the highest standard.”
Agent Lee finished the final entries. “Report sent to the Bureau and your management. Take time to rest those graceful lines, Miss Sullyoon.”
As she prepared to depart, Park Gunwoo accompanied her to the door. “The FBIA exists to ensure you shine safely. Reach out directly if anything feels off before promotions begin.”
Sullyoon paused, offering a gentle, luminous smile. “I will. This… helped more than words can say.”
The door closed behind her. Park Gunwoo washed up at the station, the weight of another uniquely demanding protocol settling. The work demanded constant adaptation, yet delivered tangible value to these talented women.
Agent Lee glanced up from his tablet. “Her integration with the larger tools was remarkably smooth. The next order is already queued.”
Park Gunwoo checked the secure device. “As expected. The Bureau’s demands evolve with each artist btw Tomorrow we have new inspector agents."
End of Chapter 10
