Meanwhile, Alex approached the play with a different mindset. She gently guided the dark-skinned gian's body parts to the positions she needed them.
She laid her palm on Zack's skin as it belonged to a newborn baby. She moved her hand over his muscles slowly, feeling every muscle on the man's firm body.
She talked to him in a low, sensual voice, close to his ears or his skin - so he could feel the warm breath coming and going all over his body.
"Did you know, Zack, that the fear of fire is written in our DNA? A blind man who never burned himself will run away from the feeling of heat before the pain arrives." She uttered each word as sweetly as dripping honey.
"Do you know what heat does to things from the point of physics?" She asked, waiting for an answer.
"Raise their temperature, Master." Zack replied. Based on his speech, his pose hasn't taken a toll on his body yet.
"Good answer." She complimented. Seeing Zack's slight twitch around his curly pubes, the key to his boner was compliments, not curses.
"That, and it makes things expand. Especially liquids, those expand rather easily." She continued the lecture. "What liquids are in your body, Zack?"
The topic switched from physics to biology smoothly, just as Alex's palms ran across the blindfolded man's wide chest. Her fingers circled around his nipples, making them hard and bumpy.
"Body fluids, Master." He said, longing for the compliment to arrive.
"List them for me." Instructed Alex, bringing her fingers around each block of Zack's abs. It was harder and harder for him to concentrate on the conversation.
"Blood, urine, sweat, semen, breast milk… Saliva, tears, spinal fluid and gastric acid." He needed a moment to recall his memories about anatomy 101.
"What about arousal fluids?" She asked, cupping his balls in her right hand.
"Yes, Master… Th-Those too." He said, already dripping said fluid from the tip of his boner.
Zack's dick wasn't especially big compared to his body overall. Compared to others though, it was enormous. Now that Alex's hand were in close proximity, the girth was about the same as her wrist.
"Now, what do you think happens when the fluids in your skin expand faster than the solid parts?" She released Zack's balls, and brought her hand around his hip.
Zack was so immersed in her touch and voice that he forgot to reply.
Alex sank her pointy acrylic nails to his skin on his asscheeks, and repeated the question. Zack exhaled deeply while biting into his lower lip, and gave up thinking for the time being.
"I don't know, Master. Please teach me!" He begged.
The pressure under the nails softened, but Alex didn't release those firm, coffee brown lump of muscles completely.
She got closer, kneeled between Zack's legs with one leg, and raised her other knee to the side. Her summer dress slid up, revealing no clothing under it.
She saddled the man's left thigh in that manner, pushing her naked pubic area on his skin. She also lifted her hands along his spine, scratching his back while hugging him more and more tightly.
"Of course I will teach you. I teach and train a gentle giant like you. And you're so eager to learn." She complimented again.
Due to height difference, Zack's hard cock was rubbing on Alex's soft belly, reaching her breasts with the tip.
Zack was trembling a little at this point. Whether it was from tired muscles or desire, Larry couldn't say.
"Yes, Master. I'll learn fast. I'll be a good boy." Zack promised, trying his best not to move around, limiting the stimulation on his erection.
"That you'll be. I could tell you the answer in many words. But I think the best way to learn is from experience. Don't you agree?" While talking, she pointed at the table with candles and the ice bucket with one of her hands.
The other hand, she placed it on Zack's face, and rubbed his thick lips with her thumb.
"Yes, Master. I agree." Panted Zack.
Mikey saw Alex's gesture, and gave her a candle and an ice cube. She stood up, walked around Zack, stopping beside his face.
"You see, Zack… Our skin is really, really sensitive to heat. First, it feels nice. Your small little hairs are standing at attention, much like your dick." She said, bringing the candle closer to his neck, ever so slightly.
"Then, as the heat rises, the sweat glands activate to cool the skin with water. When the water evaporates, it takes some of the heat away too." She waited until drops of sweat appeared on Zack's neck.
His trembling intensified; his breathing became ragged. Besides desire, fear emerged in his mind.
"With even more heat, the water doesn't have enough time to escape from the glands. It boils and expands beneath the last, dry layer of skin, which is sooo slow to expand." Said Alex.
"The water creates little bubbles of boiling water inside."
Instead of the candle, she brought the ice cube above Zack's neck, letting small droplets of cold water fall on him.
"Do you know what happens after that?" She asked.
"I… Don't… Know… Master." He struggled greatly to get the words out.
Zack had to grit his teeth to avoid screaming. He was not harmed in any way, but Alex made him believe his skin was burning.
He was no masochist, so his dick turned mostly to mush. The Master nodded her head to Mikey, and he was happy to play his part.
He kneeled before Zack's semi-erect dick, and took it - part of it - in his mouth.
Zack's first reaction was to shout in surprise. There wasn't any action around those parts for minutes, and Master was near his head. His body shook and jerked to avoid the sudden sensation.
Just a second after shocking Zack with the blowjob, Alex pushed the remainder of the ice cube directly on his neck, close to his jugular.
"The boiling little puddles of water can't break the dry skin layer. The only way the heat can go is deeper into the skin, bringing the fatty parts to boiling point too." She explained the physiology of second degree burns.
Her words were pretty much lost in Zack's painful and long screams though. He was close to chicken out, when Alex pulled off his blindfold, and took his face between her palms.
"You are good, Zack. You are my magnificent beast. Your Master is proud of you. You are the strongest, most resilient puppy pet I've ever had." Told him Alex.
She showered him with compliments, looking deep into his eyes. Her hands held his head like a feather pillow.
While Alex comforted Zack's head, Mikey made sure his dick wasn't bored either. He worked passionately on the penis that was close to half of the size of his head.
With the phantom pain induced stress out of his mind, Zack was able to actually enjoy the blowjob. Alex's voice did wonders on his reawakening lust too.
She bent closer so their forehead touched, and kept talking to her darkest puppy in those honey-flavoured words.
"You'll be a good puppy and remember this lecture, right? I know you will. You would never forget the day I rubbed my warm, wet, naked pussy on your thigh, would you?"
Poor Zack got his fair share of emotional roller-coaster that day. Right after screaming and trembling from imaginary pain, he was forced to dive deep in lust and desire again.
"Remember, how the tip of your dick touched my breast? How I was lying on your body, carving your back with my nails? Did you enjoy fucking my belly, Zack?" She tortured him a bit more.
"Yes… Master… I will… remember." He was panting deep, looking up to catch a glance at his Master's face.
Alex noticed him straining his neck backward, and looked in his eyes.
"Do you want to finish, Zack?" She asked with a loving smile.
"Can I?" Zack uttered with hope in his eyes.
Alex lowered her head closer and closer with each of his panting breaths, until she could whisper directly on his lips.
"You sure can." She replied, and kissed him softly.
The touch of those perfect lips he desired so much - and Mikey's superb technique - sent Zack over the edge. He moaned loudly, while sending copious amounts of juice down Mikey's throat.
Even with a tired body and mind, in the middle of ejaculation, he didn't dare to part his lips from his dearest Master's.