Watching the two of them coordinate their movements with such practiced ease, it was obvious this wasn't their first time.
Even though Ran wasn't participating, her naked, exquisite body and her nonchalant expression proved she was just as deeply involved with Yuu as the others. Sayuri's earlier fears were confirmed, though her worries had been far too conservative. Her two star students, Serena and Ran, had already surrendered to Yuu long before she had.
Both girls were just as beautiful as her, if not more so, and significantly younger. More importantly, there were two of them, and only one of her. She wasn't delusional enough to think her charm could make Yuu abandon a whole forest of beauties just to hang himself from her single tree.
As a mature woman, Sayuri shattered her own illusions and made the only logical choice: forget about marriage. Maintaining a secret, high-intensity sexual relationship was more than enough.
As she made her peace with this reality, she noticed the garter-like mark branded onto her inner thigh. Her mind drifted back to the moment of her peak, when Yuu's hot lava had scorched her insides and turned her eyes white; she remembered agreeing to become his "exclusive."
She realized then that Yuu and the girls weren't staring at her pussy out of curiosity, but rather studying the mark.
"Yuu... this ability of yours..." Sayuri whispered, watching him continue to plow into Serena. She didn't regret it, but she was fascinated by the supernatural nature of the mark, especially since she didn't see anything similar on Ran or Serena.
Serena's contract mark was on her lower abdomen, currently hidden as she was pressed face-down into the mattress, her round ass taking the brunt of Yuu's relentless thrusts.
"Whew—" Yuu exhaled sharply, not lifting his head. "Ran, explain it to her. I'm a bit busy right now."
Serena was in no condition to speak. Aside from rhythmic, high-pitched whimpers, she was incapable of forming words. Ran gave a helpless smile and began to explain the "magic" to Sayuri.
Yuu had decided that "Magic" was the perfect catch-all excuse. It explained away his superhuman stamina, his marks, and his strange powers. In a world where a teen detective could turn into a child, the existence of low-level magic wasn't even the strangest thing happening.
As Ran "explained," Yuu neared his limit. This was his absolute favorite position. He had many favorites, but this one sat at the top of the list.
Serena was pinned flat on her stomach, her long, slender legs pressed tightly together. Yuu was positioned behind her, his thighs spread as he rode just below her perky, bouncing buttocks.
In this position, he could lean forward and crush her delicate, sexy body beneath his own. He could grab her slender neck for a sense of total domination, reach around to squeeze her breasts, or grip her narrow waist to stabilize his high-speed gallop.
She was his living toy, completely at his mercy.
The best part was the mechanical advantage. From this angle, the vaginal canal was at its tightest, constantly "milking" him with every thrust. Because it was a rear-entry position, he could penetrate to his maximum depth, with the base of his massive cock buried deep between her fleshy, elastic butt cheeks. Given Yuu's exaggerated size, this was the only way he could feel entirely "shrouded" without worrying about bottoming out too painfully against her cervix.
The only drawback to this position was that if a man lacked the necessary hardness or length, it was easy to slip out. For Yuu, that simply wasn't an issue.
As Ran finished her explanation, Yuu reached the finish line. Serena's face contorted into an expression of such intense, soul-shattering pleasure that Ran felt a fresh wave of heat between her own thighs.
Yuu's hot essence flooded into Serena's depths, making the girl sob with ecstasy. Yuu didn't feel guilty; he felt triumphant. This was his fourth "load" of the day, yet he felt like he could keep going forever.