Flaccid, unimpressive.

...unimpressive. Shy. They looked nearly identical in their ****, soft state. For you, there was a genuine reason. You weren't an actual mage so you had to get your balls emptied every day in order to supply Rider with the necessary mana. Literally, three hours ago, you had to cum into a bottle and hand Rider the bottle.

Rider was...sultry, but also sensitive. She did not want to have sex with you right off the bat. Only after weeks of knowing each other, fighting together, and nearly dying did this situation come to fruition. Rider was willing to sleep with you, only because you had proven yourself to her. Before, it was simply a matter of cumming into a bottle and making her drink it.

So yeah, your drained out wiener made sense. You caught a glimpse of Shirou’s, a pinkish, small thing, and felt a pang of shared nervousness. Did Rin empty him out too or something?

Rider’s smile widened. “So timid,” she whispered,. “All that potential, hiding away.” She shifted, allowing the incredible swell of her breasts to press against your cock, the heat and weight of them impossibly erotic. “I wonder what it will take to coax it out.”

Glances from Rin and Shirou were sent your way. They could hear the sultry remark.

Ringer's fingertips, finally, traced a feather-light path up your nutsack. You jerked at the contact. She wasn’t just touching you; she was mapping you. Her fingers walked on your sack, step by step. You couldn’t help but respond, a thick, heavy heat beginning to pool in your groin as blood rushed to answer her silent call.

On the other side, things were less graceful. “J-just relax, Shirou,” Rin stammered, her face crimson. She gave his soft length an awkward, dry pump with her hand. “We need to… you know… for the mana.”

"R-right!"

Shirou was getting hard, and fast. That threw away the theory that Rin drained his balls everyday. He was just nervous, a little small, and ultimately, very eager. The redhead got hard fast.

Rider’s attention was divided. She glanced over at Shirou, then back at your slowly growing cock. “Look at that,” she cooed, her gaze flicking between the two of you. “It seems the view is inspiring for everyone.”

And it was. Under Rider’s expert which only walked around your cock, never grabbing it and simply teasing to an **** degree, you were hardening, lengthening, thickening with every second. Seeing your transformation, Rin grabbed Shirou's cock and starting jerking it.

"G-get bigger," Rin murmured, and redoubled her efforts on Shirou, her jerking motions becoming more frantic until he couldn't.

The climax of the reveal was breathtaking.