Ding-dong! Ding-dong!
The frantic doorbell snapped Elf out of her daze. It was late afternoon. What was supposed to be a rehearsal had turned into a marathon sex session. The elegant Elf was now a mess of sweat, her golden hair stuck to her face and her small breasts.
She jumped out of Rin's lap. "You ruined my nightgown! Get me some clothes! Hurry!" She tried to wipe herself with tissues, but it was useless. She was covered in his cum, and it was still leaking out of her. Her belly was slightly swollen from the sheer volume he'd pumped into her.
"Utaha isn't a stranger. We've had a party together, she won't mind," Rin said. It wasn't Eimi at the door; it was Utaha Kasumigaoka. She had classes and could only come over after school.
"Then... carry me!"
Elf couldn't be elegant, but she refused to look pathetic. Rin picked her up, his palms acting as a plug for her leaking pussy. He checked the peep-hole to see a frustrated Utaha crossing her arms and tapping her foot.
The moment the door opened an inch, Utaha shoved it open.
"Eep!"
Utaha was immediately hit by the scent of sex. She looked at a smirking Rin and her shoulders began to shake with rage. She'd been told there was "important business" to discuss, had rushed over after school, waited forever at the door, and now she was being greeted by the sight of them post-coitus?
She slammed the door shut and walked in. Elf was still being carried by Rin, her sensitive spots fully exposed.
"AH!" Elf cried out in pain as Utaha reached out and pinched her clitoris hard with her thumb and forefinger.
"Hmph." Utaha smirked, twisting her fingers until Elf broke into a cold sweat. Only then did she let go.
"Bastard... that hurt! You almost broke me!" Elf hissed. She didn't dare provoke Utaha further; that spot was way more sensitive than a toe.
In the living room, Utaha found a clean spot on the sofa. She crossed her long, black-stockinged legs and glared at them. "Don't tell me you called me over just to show off your messy pussy."
"Not quite," Rin said, letting Elf down but keeping a hand over her distended belly.
"It's like this... Elf is having her celebration and new book launch soon. Didn't you two agree to a sales battle?"
"Yes," Utaha nodded. She had already coordinated with her editor to release her book on the same day as Elf's for a fair fight.
"In that case... do you want to hype it up? A 'collaboration' or a rivalry stunt."
Rin's plan was simple. Utaha's fans looked down on Elf's "low-brow fanservice," and Elf's fans looked down on Utaha's "pretentious, slow-burn romance." They were already fighting online. If they brought the rivalry into the spotlight, it would create massive buzz, drive sales, and give them a reason to officially join Baumkuchen Studio together later.
"Don't make it too hostile," Rin suggested. "Just say you're friends who have a friendly wager on who sells more."
The girls thought it over. It was a good marketing move. But for them, it was more than marketing. It was a war of pride.
"Fine," Utaha said, looking down her nose at Elf. "How pathetic. After the collab, your fans will finally realize how trash your writing is compared to mine."
"More like your fans will get a taste of my pacing and realize they can't go back to your boring, dragging 'emotional' scenes," Elf retorted, wiggling her hips.
Utaha looked at Elf's cum-filled belly and smiled. "Since you're so confident, how about we up the stakes?"
Before, they just had a verbal agreement. Utaha was at a disadvantage because Elf had a larger existing fanbase. A collab would help Utaha more than Elf by exposing her work to a wider audience. Utaha was confident that once people read her work, they'd be "NTR'd" away from Elf and become her loyal readers.
"A bet? What do you want to wager?" Rin asked.
"Bring it on!" Elf snapped.
"Heh..." Utaha's smile turned predatory. "If I win, I get to fuck your ass with a double-ended dildo."
"Fine! If I win, I'm doing the same to you!"
"Pfft..." Rin burst out laughing.
They weren't lesbians, but the idea of using a double-dong to humiliate the other's "backdoor" while Rin watched was clearly enticing to both. This wasn't about sex; this was about Ultimate Humiliation!