8 inches vs 4 inches

Where once there were two nearly identical, nervous members, now there was a staggering difference. Shirou had reached his full, modest potential. A respectable, but utterly dwarfed, four inches.

Because you? You were fully, achingly hard, a thick, veined eight inches of solid arousal jutting up from your hips. You were a king on that bed. Your cock sat atop of Rider's face who smirked. Behind those blindfolds, however, there was a flicker of surprise. Even she didn't expect this kind of size.

Rin could show her reaction in full since she wore no blindfold. Her hand stilled on Shirou’s shaft. “O-oh,” she breathed, the sound full of genuine, unguarded shock. She’d only seen diagrams, clinical pictures. The reality of the spectrum was clearly a new, shocking lesson.

Rider’s smirk was triumphant, her voice a silken taunt meant for the whole room. “It seems I got the lucky draw.”

Shirou looked over and was about to ask, "Ha? What does that-?"

She didn’t give anyone time to dwell on it. She lowered her mouth to you.

The world dissolved into dicksucking. Her lips, plush and surprisingly cool, sealed around the head of your cock. Her tongue, that infamous snake-like muscle, flickered against your slit, a quick, torturous probe that stole the air from your lungs. It was like nothing you’d ever felt—intelligent, agile, and impossibly skilled.

This was Medusa's blowjob.

"H-nnggh!"

You made a loud grunt.

You dared to glance over. Rin, steeling herself, had finally taken Shirou into her mouth. She did not go deep at all, partially because she didn't have to. She only focused on the tip. Her tongue technique was clumsy and uncertain. Her dips were small and shallow, like she was afraid of taking his cock easily. Because, well, it seemed like it.

"R-Rin...!"

At the end of the day, it was serviceable, but it was a candle next to Rider’s inferno.

Rider took you down every single inch of your cock and then went back out, her long hair tangling over your stomach and chest, her tongue wrapping around your shaft in a way that defied human anatomy. She was no longer deepthroating, only doing it to experiment. She showed the full length of her tongue and its skill. Applying pressure in spirals, milking you, coaxing you toward the edge with every unhurried bob of her head. A low, continuous moan vibrated through her throat and into your very bones. She was enjoying this. She was savoring you.

"R-Rider...!"

Her blindfold eyes twinkled. You couldn't see her eyes and yet sometimes it felt like you could. It was how you knew they were violet in colour; there was this strange connection letting you see a snippet of them. Your hips bucked involuntarily. You were close, so close, the tension coiling unbearably tight in your sack. Rider sensed it. She showed everything she needed to, let her tongue slither back into her mouth, and returned to the classic deepthroating. Her throat opened to take you even deeper until your tip hit the back of it.

That was it.

"Cumming!" Your vision whited out at the edges. She didn’t pull away. She stayed there, taking your release, your eyes meeting.

A beat later, a muffled groan came from Shirou. You saw Rin’s throat convulse once, twice, as she swallowed his entire, measly load with a quick, efficient gulp. The mana transfer demanded it.

Somehow, despite you cumming first, Shirou's climax ended first. When Rin pulled out, she was stealing glances at you and Rider who were evidently not done.

Spurt, spurt, spuuurt!

You had plenty to release. Plenty for Rider to swallow.

"Haaah~!"

Rider finally pulled back, your spend dripping from her chin. She gave a lazy, contented swipe of her incredible tongue, catching a drop from her lip, but she made no effort to clean the rest. She let it stay there, a glistening badge of honor. “Mmm… potent,” she purred, her voice thick with satisfaction.

Spurt, spuurt!

To everyone's surprise, even the observing Rin, extra thick, hot ropes of cum painted Rider’s face and hair. "Ah~!" A second wind of sorts, with pearlescent streaks splattering across her pale skin and glistened in her purple locks.

Rin went wide-eyed and so did Rider. Her blindfold was ruined and covered in cum. "What a lovely surprise, Master."

With a smirk, she took them off. Rin did a double-take. "Rider, wait, no!"

"Don't worry. My damaged Spirit Core has temporarily locked away my Mystic Eyes."

Beautiful eyes greeted you, violet and glossy and making your cock twitch. This was it. This was the true Rider. Her real face. The gaze that you could always feel and never see visually was officially here.

"Such a good boy, aren't you, Master. Having all this mana for me~"

Rider smirked. Rin just sighed in relief. The genius mage sat back on her heels, a thoughtful, almost clinical frown on her face. She eyed Shirou's half-erect cock and wiped her mouth with the back of her hand, muttering almost to herself, “I suppose… the volume and viscosity are directly proportional to the…” she clicked her tongue at Shirou’s now-softening, small member, “…the source material.”

"What's that supposed to mean?" Shirou asked, genuinely confused.

Rider just laughed, a low, sensual sound as she gazed down at you, your massive cock still twitching against your stomach. “It means some sources are simply… more bountiful than others.” Her finger traced a slow, possessive circle around your sensitive head. "Isn't that right?"

The last drops of your release were still cooling on Rider’s face when Rin, ever the pragmatist, broke the sated silence. Her voice was a clipped, businesslike counterpoint to the heavy breath still fogging the air. "Right. That was… sufficient for the first transfer. But like I said from the start, need a significantly greater volume of raw mana to complete the core repair. At least three." She avoided looking directly at anyone, focusing instead on a point on the wall above Shirou. "I didn't realize guys went soft after the first one so soon."