Lesson 11: Sample Collection Although I also reached the peak of pleasure, I still hadn't cum. The visual and auditory impact just now was too intense, leaving me in a delayed state of arousal. My cock was hard as iron, still craving the final release. I slowly pulled my cock out of him, making a wet "pop" sound, like separating stuck skin. Dr. Lin's body went limp with my movement. Panting heavily, he held onto the partition, turned around, stepped out of his stall, and entered mine. He looked at my still-erect massive shaft, his eyes filled with awe and obsession. "That's amazing..." he muttered, his voice hoarse and shaken. "Is this the power of shockwave combined with real action... It's like a nuclear reactor." He glanced at the mess on the floor, a mix of semen and traces of Dr. Lin's incontinence, then looked at me. "You haven't finished yet?"I shook my head, breathing heavily. "You squeezed me so good that I didn't want it to end too soon. I just wanted to prolong this pleasure." Dr. Lin smiled, a seductive, almost demonic charm that pushed his handsomeness to the limit. Struggling to his feet, though his legs were still a bit weak, he knelt in front of me. "Then let me help you with the final step." He reached out, gripping the base of my shaft with practiced precision. "After all... our original goal was to collect a sample, wasn't it?"This line suddenly pulled the lewd atmosphere back toward a hint of "medical" boundary, making the subtle tension even more irresistible. He used the most professional terminology to annotate the most out-of-control behavior. One hand stroked my penis while the other picked up the collection cup that had fallen nearby. He took it out of the sterile bag with swift movements, as if nothing had just happened. "Come on, Haosheng, shoot your freshest, thickest essence right in here." His voice was low and seductive, like issuing a sacred command. "I'll personally check your health status." His hand technique was excellent, fingers nimbly stimulating the coronal sulcus, palm warmly enveloping the shaft, varying pressure to perfectly control my rhythm. His lips weren't idle either, occasionally leaning in to kiss my glans, tongue flicking the slit for the final lethal blow. "Mmm... Doctor... your hands..." I tilted my head back, hands grabbing his hair as waves of pleasure crashed over me. I could barely stand. The pleasure accumulated from fucking him from behind was now layered and stacked in his hands, pushed to the edge of explosion. I watched his handsome face flush with desire, staring intently at my cock as if it were the most precious treasure in the world, and his task was to thoroughly extract its value. "Almost... right there..." I felt the familiar heat surge from my tailbone straight to my head. My balls tightened, all energy converging at the tip. "Cum for me, give it all to me." Dr. Lin sped up his hand movements, the other hand steadily holding the collection cup, aiming it at the muzzle like welcoming a bountiful harvest. "Ah—!" I growled low, my hips thrusting forward sharply. Under Dr. Lin's tight stroking, a hot stream of semen shot out. First spurt, second, third... This was the largest volume and farthest range I'd shot in months. The thick white liquid accurately landed in the collection cup with a "tap tap tap" sound, even overflowing a bit due to the amount, dripping onto Dr. Lin's fingers and staining his latex-gloved hands. Dr. Lin didn't flinch. Instead, he watched like enjoying a fireworks display, eyes full of admiration. Only after I finished the last drop did he stop, seal the cup, then extend his tongue to lick the overflowed semen off his fingers. "Mmm... very rich flavor." He made an evaluation, expression like tasting top-grade caviar, eyes gleaming with satisfaction. "Looks like the motility should be very high. This data will be excellent." The two of us sat disheveled in the cramped toilet stall, the air filled with a blush-inducing scent. It took a while for our breathing to gradually calm down. Like thieves, we hurriedly fixed our appearances. Dr. Lin first passed my clothes through the hole, then straightened his white coat, restoring his dignified demeanor—except for the lingering spring in his eyes and brows. "Wait for me outside," he said quietly, holding the bottle full of my essence. "I'll use the back door to return to the clinic and handle this 'sample.'" Five minutes later, I sat in the clinic chair. Apart from slightly messy hair, I looked no different from when I entered. Dr. Lin walked in holding a document, face wearing a standard professional smile, as if the person who had just been fucked to incontinence in the toilet wasn't him. "Mr. Chen, was the collection process smooth?" he asked seriously, but under the table where I couldn't see, he gently kicked my calf, giving a signal only accomplices would understand."Very smooth, Dr. Lin." I played along. "Excellent." He checked several items on the medical record. "Preliminary observation shows the sample's volume and color are perfect. The detailed report should be ready in about a week. Please come back then to pick it up." He paused, a glint flashing in his eyes as he lowered his voice, full of implication. "By the way... we can discuss if there are any 'enhanced' follow-up treatments. After all, maintenance is a long-term matter, right? We need more scientific, in-depth tracking." "Enhanced treatment?" I raised an eyebrow, understanding his hint. The desire for that 90-degree forbidden zone surged again.I felt a bit of heat in my lower body again."Alright, I'll definitely come back on time." I stood up and extended my hand. "Thank you, Dr. Lin." He shook my hand, his palm still warm from before, thumb lightly brushing the back of my hand. "You're welcome. It's my honor to serve you, Haosheng." For the first time in the clinic, he called me by my name. Walking out of the clinic, the rain outside had stopped, and sunlight pierced through the clouds. I took a deep breath, feeling the air unusually fresh, as if the world had been renewed by our taboo experiment.The gloom and emptiness of the past few months were swept away. This was a long-term "treatment" full of infinite possibilities. Looking at the appointment slip in my hand with the time for next week, I couldn't help but smile, walking lightly toward the MRT station. What new games will we develop during next week's follow-up? Just imagining it fills my future life with unprecedented motivation. Lesson 11: Sample Collection — End

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