Go for the facial!

"Pull back girls, I want to cum on your faces!" Denki decided as he reached the edge. Eiko pulled off of his cock obediently, looking up at him in pure excitement. Mina pulled away from his balls, and put her face beside Eiko's. Their eyes, full of pleasure, met his as they opened their mouths, and extended their tongues.

"Give it to us, Master!" Eiko pleaded, letting herself get swept away in the sheer enjoyment of the fun they were having. Denki grunted, and ejaculated on their faces, several jets of his pearly white seed shooting out of his manhood. Most of it hit their tongues, and they crooned, swallowing it, though some landed on their faces.

This however gave them quite a thrill. On the surface, this seemed to be a demeaning act, but to them, it simply showed submission, freely given, and sincerely enjoyed, rewarded with a sense of bliss from Momo's power. They then turned to face each other, and started to lick at each other's faces as they contunued to scissor each other.

Denki panted, and sat, simply watching them both as they finished each other off. Once they had cleaned each other's faces, they kissed each other, before moaning out loudly as their hips quivered and spasmed from bringing each other to mutual rapture. After a moment of maintaining the kiss, they broke it, wheezing, then turned grins to Denki.

"Wow... I definitely have no regrets, Master... I feel so... free, ironically enough..." Eiko sighed blissfully.

"Shedding one's inhibitions will do that~!" Momo chirped. "True, you are now bound to your Master's will, sexually speaking, but, you are also liberated from societal dogma about sexual taboos."

"In short, we traded one set of metaphorical chains for ones more pleasant to wear," Mina giggled, Momo nodding in agreement.