Tell them not to worry

You shrugged off Natsuki's rudeness. "Don't worry about it, I don't mind if you go do your own thing."

Yuri still looked bothered, but Natsuki pulled her away, leaving you with Sayori and Monika. Monika sighed. "I apologize on behalf of my club members."

You shook your head. "It's really fine."

Sayori nodded, then cheerfully explained "He'd just say it if he was bothered. He can be kinda blunt like that."

"It sounds bad when you say it like that." You complained.

Monika chuckled. "You two really are good friends, aren't you?"

Sayori happily nodded.

After a moment, you asked "So, is there anything else I need to know about to join this club?"

"The standard safeword is 'piano'. After all, there's no music in a written story." Before you could ask what she was talking about, Monika dug into her bag, then slid you a form. "Other than that, I just need you to sign this so I can officially register you."

You took a moment to look over the form. It looked like a standard application for joining a club, and stuck to the story of it being a literature club. "This won't lead to me getting into trouble, will it?"

Monika shook her head. "As long as none of the school staff finds out what we actually do here."

"That... Is not the most reassuring answer you could have given. Or all that reassuring at all actually."

Sayori pouted at you. "We all are officially registered. You aren't going to flake out if things start to look bad, are you?"

"I just don't want to end up getting expelled because you dragged me into this." You sighed, then signed the paper. The two girls beamed at you.

"I'll go get this turned into the office before everyone leaves." Monika stood up. "You two can go ahead and get started."

You looked to Sayori, and then leaned back as she suddenly shoved a coil of rope at you.

"Wait, where did you even get this?" You asked as you reflexively grabbed it.

Sayori just giggled. "That's not important." She held her wrists together in front of you. "Don't you want to tie me up?"

You automatically started finding the ends of the rope, which actually turned out to be more than one rope coiled together now that you were paying attention, then stopped as you thought about what was happening. Sayori, who you had known since before you could even remember, was asking you to tie her up. Could you really do... sexy stuff with her?

"Something wrong?" Sayori asked.