So this is a Kotonico story, it's not the most popular ship but the idea just came to me and I found it funny so yea why not (I'm sadistic poor Nico I'm sorry). ~

This happens after the moment they all sewed the costumes together and Nico was bored by it.

"Aw finally finished... That was exhausting..."

"You're so lazy Nico-chan nya !" Nico clicked her tongue.

"You're the one hyperactive.." Everyone left the clubroom, except Kotori who retained Nico.

"Everyone, go ahead, I've just got something to say to Nico. ~"

"Okay Kotori-chan, see you tomorrow !" They came back to the clubroom, Kotori locked the door.

"What do you want ? And why are you locking the door ?" Kotori ignored the questions and went to the costumes, looking at them carefully.

"Hey, you're not so bad at sewing."

"You're ignoring me... Of course the super idol Nico-nii is good at ever-.. W-what are you doing ?!" Kotori hugged Nico from the back and pushed her face to the wall.

"Ko-Kotori ! What's that ?!" Kotori began to lick Nico's neck, making her gasp as she tried to retain her moans. Her hands moved to Nico's inner thighs, rub the growing mount. She felt her hand into the panties. 'She's putting something... what's that ?!'

"And what do you think about everyone finding out that the super idol Nico-nii has a dick ? Wouldn't that be funny ?" She began to move her hand around it slowly. 'Ugh... What ? I can't escape.. Since when is she that strong..?'

"H-how the hell did you figured out that I had th-this ?! And what did you put on my cock ?!" She had difficulty to contain her moans, but Kotori suddenly stopped and Nico felt her hands being tied up. She tried to struggle but she couldn't do anything against Kotori.

"You know, you can find pretty much anything when you're willing to look hard enough. ~ As for what I've put on you, it's a toy called cockring." She showed a chair.

"C'mon sit there. ~" 'Since I can't do anything let's obey... What did I do to her..?' Kotori tied Nico's legs on the chair.

"Ow... What a beautiful pic... Our cute Nico tied in such a lewd position with her throbbing cock.." she took up her phone.

"Wh-what ?! Kotori ! Don't take pictures please ! I-I beg you..."

"Huh ? You're begging me ? Begging means that you would be kneeling in front of me. Now look at you, tied up so weak and unable to do anything but talk.." Nico began to sob as Kotori began to film.

"Your tears are also beautiful. ~" She licked the tears off of Nico and began to crouch down, poking the fully erect thing.

"You really are turned on right now.. I didn't think you were that lewd, Nico-chan ! Look over my phone, here. ~"

"Y-you're the one pervert.." Kotori pretended that she didn't hear.

"Huh ? Did you say something ? ~" She turned off her camera and began to suck on the cock harshly, making Nico moan loudly. Nico arched her back, ready to cum, but Kotori stopped all of a sudden. Nico was panting heavily, flustered.

"Wh-why are you doing all this... Are you even Kotori.. ? What did I do wrong ?" Then she remembered what Kotori said when they entered in the clubroom.

"It's about the costumes.. ? It's because I said it was annoying while we were making it.. ?" Kotori smiled to Nico happily.

"Bingo ! Now how about leaving ?" She stood up, putting back her stuff in her bag.

"H-huh ? I can't leave right now.."

"Oh, right ! I'm sorry, I almost forget, hehe. ~" She untied Nico and unlocked the door.

"And for the cockring, you can keep it, it's a gift. To make it vibrate, just push there." She got off of her bag a remote control and pushed on the button for the strongest stimulation, making Nico almost screaming in surprise and ecstasy, as she cummed right on the floor.

"Hghnn.. Kotori... Gimme that remote control... I can't take it anymore..." She had taken back her phone and filmed everything, before leaving calmly

"I'll leave it in your locker, come and pick it up whenever you want ! See you tomorrow. ~"

'D-damn.. I can't withdraw it until I stop the vibration... I have to pick it quickly.. but what if someone see me... Fuck it..'

Thanks for having read this ! It might be a bit short but I wanted to let Nico with the situation all by herself. ~