Oh, very interesting and kinky.

(Warning, futa content in this chapter!)

Suu suddenly moaned as her body absorbed his seed. "Suu? You okay?" Kimihito asked with some apprehension.

"Suu feels weird..." Suu replied as her crotch right above her pussy seemed to bubble. Then slime rearranged itself to form...

"...oh... That's interesting," Kimihito remarked as he stared at the seven inch erect cock that had emerged from Suu's crotch. It wasn't a complete penis, as she still had her pussy, and lacked a scrotum, but it seemed like it would serve the purpose of pleasuring the other girls.

"Indeed, it is... Rather bizarre, Master," Cerea said, leaning forward and examining the dick on Suu. She then caught a sweet odor coming from it, and recoiled, blushing as she felt quite aroused, and gazed at it intently.

"Cerea, what's up?" Miia asked as Cerea panted. Suu meanwhile curiously reached for her shaft and started stroking it.

"Ah! That feels weird, but good..."

Miia leaned in, tongue out, and also caught the scent, and pulled back. "...I... It think it's emitting pheromones," she panted out, and both she and Cerea leaned in further.

"Indeed... I can't get that thing out of my head..." Cerea admitted, scenting more pheromones. Suu looked up at them, and grinned, leaning back on her hands and spreading her legs, offering the new appendage to them as it twitched, their eyes following it. Kimihito also watched, intrigued.