Experiment (3)
Ha Yul unbuttoned several of Seol-hwa's shirt buttons in one motion. Pale skin, lingerie, and the curves of her breasts—now freed from their restraint—came into view. Ha Yul instinctively lowered her head. Her lips slid along Seol-hwa's neckline and collarbone before settling over her chest. Seol-hwa's breath hitched for the first time.
Ha Yul pushed the shirt and bra upward with one hand, fully exposing her breasts, while her other hand glided up the inside of Seol-hwa's thigh and slipped beneath her skirt. A faint heat and tension radiated through the fabric of her panties. When Ha Yul pressed and dragged her fingertips over the surface, Seol-hwa's hips twitched and trembled.
Ha Yul cupped one of Seol-hwa's breasts. The flesh yielded softly beneath her palm, already firm at the peak. "You said you were sturdy, but this confirmation feels rather rough," Seol-hwa murmured, her voice trembling with excitement despite the words. Instead of replying, Ha Yul slowly pressed her thumb against the nipple before taking it into her mouth. Her tongue circled the bud, sucked lightly, then bit down with more force. Seol-hwa's breath stretched into a long, shaky exhale.
Seol-hwa ran her fingers through Ha Yul's hair, gripping a little tighter. Meanwhile, Ha Yul's other hand slid inside Seol-hwa's panties and parted the heated folds, touching her directly. The moment fingertips met slick skin, Seol-hwa's thighs clenched, then slowly relaxed. She was already thoroughly aroused. Ha Yul rubbed her clit with her thumb in slow circles while pressing her index and middle fingers against the entrance.
"Haa… Going straight for my pussy like that—you're making it obvious how turned on you are," Seol-hwa teased. Ha Yul lifted her mouth from Seol-hwa's breast and spoke in a low voice. "You talk too much."
Ha Yul continued stroking the clit with her thumb while slowly pushing her fingers inside. Seol-hwa was wetter than expected; each additional knuckle drew a subtle lift of her hips. Keeping her lips sealed around the breast, Ha Yul curled her fingers to stroke the inner walls, pressing and circling the clit at the same time. Seol-hwa could no longer form full sentences, only soft, broken sounds escaping her throat.
Ha Yul moved her fingers in and out at a measured pace, adjusting the angle to read every reaction. Seol-hwa tried to maintain her usual composed expression, but her body told the truth. The more Ha Yul felt those honest responses, the harder it became to contain her own rising heat. This was different from the adrenaline after a hunt—here, it was wet flesh, body heat, and moans that stoked the fire.
When kisses and caresses were no longer enough, Ha Yul lifted Seol-hwa into her arms and stood. Her enhanced muscles responded instantly; Seol-hwa's weight felt almost negligible. Seol-hwa looped her arms around Ha Yul's neck and laughed. "Checking your output right after the experiment too? Such a diligent test subject."
Without answering, Ha Yul carried her to the nearest workbench and set her down. The cold metal against Seol-hwa's heated skin made her inhale sharply. Ha Yul pushed the skirt higher, spread Seol-hwa's knees, and looked down at the glistening folds. The labia were soaked, the clit slightly swollen and twitching. Heat surged through her at the sight. She dropped to her knees and leaned in.
Her tongue dragged slowly over the clit. Seol-hwa gripped the edge of the workbench. Ha Yul licked broadly across the entire sex before focusing on the clit with quick, firm strokes. "Haa, wait… ngh, that's sensitive there."
Ha Yul didn't stop. One hand held Seol-hwa's thigh open while two fingers slid back inside. Her tongue worked the clit while her fingers stirred and searched for the most responsive spots. Seol-hwa's legs trembled on the workbench; her upper body arched, breasts heaving. When Ha Yul pressed the clit hard with her tongue at the same moment her fingers curled upward, Seol-hwa threw her head back with a sharp, ragged gasp. The teasing composure had vanished—her eyes were glassy, lips parted.
Ha Yul looked up at that expression and drove her fingers deeper, then withdrew slowly before changing the angle on the next thrust to stroke the inner walls. Wet, obscene sounds filled the lab. Once Seol-hwa was thoroughly worked up on the workbench, Ha Yul pulled her down again—this time guiding her to a regular chair. She seated Seol-hwa and lowered herself between her spread legs, half-kneeling.
Ha Yul enjoyed the new angle. She ran her palms up the insides of Seol-hwa's knees, then buried her face between her thighs once more. This time she moved slower, more relentlessly—fingers rapidly teasing the clit while her tongue and lips licked, sucked, and gently bit at the surrounding flesh. Seol-hwa tried to steady her breathing, but every touch from Ha Yul's tongue made her react differently. Eventually she had no choice but to grip the armrests tightly.
"Ha Yul, fuck… ahh…"
Seol-hwa could only moan. Her hands alternated between Ha Yul's hair and shoulders, thighs trembling. Ha Yul slowed further—barely brushing the clit with the tip of her tongue, pausing, then licking longer only when Seol-hwa's hips lifted in search of more. Three fingers now moved inside, stretching and sliding. Seol-hwa was dripping; every thrust produced wet sounds. Ha Yul listened to those sounds and the way Seol-hwa clenched around her fingers, growing bolder.
Seol-hwa finally grabbed Ha Yul's hair and rocked her hips forward. Ha Yul seized the moment, sucking the clit between her lips while her fingers scraped upward hard. Seol-hwa's back arched off the chair, thighs shaking violently as her knees tried to close. Ha Yul forced them apart again. Seol-hwa leaned back against the chair, hips twitching uncontrollably.
But Ha Yul wasn't finished. She pulled the trembling Seol-hwa up and pushed her toward the desk. Seol-hwa braced both hands on the surface, bent forward, unable to look back. Ha Yul pressed against her from behind, one hand cupping a breast while the other parted her thighs again. The sensation from behind felt different—Seol-hwa could only guess at Ha Yul's movements through touch, making her even more sensitive.
Ha Yul drove two fingers deep, twisting her wrist to stir inside. Seol-hwa's grip tightened on the cables and folders scattered across the desk as she panted. "From behind like this… your tastes really are quite depraved."
Ha Yul whispered against Seol-hwa's ear. "You say that, yet you seem to like it." She pressed her thumb firmly against the clit and moved her fingers faster. Seol-hwa leaned harder into the desk, moaning. Ha Yul took the opportunity to suck at the nape of her neck. Stimulated from multiple angles at once—breast, neck, and sex—Seol-hwa's breathing completely unraveled. She couldn't even call Ha Yul's name properly, only gasping as her inner walls clenched tighter around the fingers with every thrust, producing thick, wet sounds.
Even after finishing on the desk, they didn't stop. They moved to the floor. The cold surface against knees and palms only heightened the heat. Seol-hwa half-reclined while Ha Yul settled between her legs and kissed her again—deeper, longer. Seol-hwa pulled Ha Yul closer by the neck. Ha Yul nipped at her lips before moving down to her neck and breasts. Clothes scattered further; shirts, skirts, gloves, and sensor pads littered the floor. Seol-hwa's ragged breathing amid the sterile lab looked obscenely erotic.
Half-draped over Seol-hwa on the floor, Ha Yul sucked at her breasts while her fingers slowly worked inside again. Every time her fingers withdrew, Seol-hwa's hips lifted; Ha Yul pinned her down with her body. "Ha Yul… your fingers are too deep right now."
"Don't like it?"
"If I didn't, I would've bitten you already."
At that answer, Ha Yul thrust harder. The sticky grip of Seol-hwa's walls around her fingers and the way she kept rubbing the clit made Seol-hwa twist on the floor. Ha Yul's enhanced muscles held her thighs and hips firmly in place, preventing escape. The lab's chemical scent was gradually replaced by sweat, heat, and the smell of sex.
When Ha Yul pressed Seol-hwa against the wall, all traces of playfulness and observer's distance had vanished. Seol-hwa leaned back, panting, while Ha Yul held her waist with one hand and kissed her again. Between kisses, short breaths escaped Seol-hwa. Ha Yul slipped her hand between her thighs once more, this time rougher—spreading her and driving fingers deep. Seol-hwa's hips jerked, but Ha Yul ignored it and thrust harder. Her movements grew faster, forceful enough to make Seol-hwa's shoulders and the back of her head tap lightly against the wall. Her thumb ground relentlessly against the clit.
"Wait, Ha Yul… if you do it like that—"
Seol-hwa's words broke into moans. Ha Yul thrust three more times, hard, then curled her fingers and dragged them upward. Seol-hwa's walls clenched violently; her knees buckled. Ha Yul caught her, spreading her thighs wider to keep her upright against the wall. Seol-hwa clutched Ha Yul's shoulder with one hand, the other scrabbling at the wall, barely able to breathe. Feeling that tremor, Ha Yul moved faster and rougher. Wet sounds spilled out with every thrust. When her thumb and fingers found their rhythm, Seol-hwa finally came hard, body shaking against the wall. Her sex pulsed around Ha Yul's fingers again and again. Ha Yul kept her fingers inside, stroking slowly through the aftershocks until the spasms eased.
Finally, they reached the door. Both were breathing hard; the lab was a mess of discarded clothes and fluids. Seol-hwa leaned against the door, half-hanging onto Ha Yul, who supported her waist with one hand while her other fingers slid back inside. This time she moved slowly but deeply, wringing out the last of the heat rather than driving hard. Every thrust made Seol-hwa's shoulders bump the door; her thighs trembled with each brush of the thumb. Seol-hwa was so oversensitive that even light stimulation made her clench. Ha Yul felt her own arousal gradually subside with each reaction.
Seol-hwa seemed to notice too. She let out a breathless laugh. "I wonder what your lovers would think of this level of skill."
Ha Yul kept her fingers buried deep. "You're bringing that up now?" She twisted her fingers hard inside, pulling another orgasm from Seol-hwa. Seol-hwa leaned her head against the door, panting in short gasps, legs giving out as she slumped against Ha Yul. Ha Yul finally exhaled, feeling the heat recede.
At that moment, the doorknob turned and the door opened.
"Seol-hwa, I came to check on the data analysis—"
Se-a's words trailed off. Through the gap she saw clothes strewn across the floor, the wrecked lab, the two women pressed together in the doorway, and Ha Yul's fingers still inside Seol-hwa. Her eyes widened, her expression froze, and a tiny sound slipped from her lips.
"Ah."
Ha Yul and Seol-hwa turned their heads at the same time. The air in front of the door, which had been burning moments ago, turned abruptly cold.