Use your ring.

"Have this back!" you shout with your hand out-stretched. Suddenly, a cloud of tendrils burst from your ring, sending the spell she used earlier straight backwards her. It's far too late for her to dodge. She's committed to the trajectory of her attack, and now she's about to pay the price.

Most of the grasping tentacles find purchase around her limbs or body, and it proceeds how it was meant to when used in your direction earlier. That is to say, not only does it grab but it pulls as well. Unable to escape at least in the moment, Gwynevere is heaved towards you at a similar speed, though now without her rapier ahead. Not only that, but you pull her down and directly into your previously placed Entangle spell. Suddenly, even more tendrils, these ones blue, burst up and replace those using to pull. That one dissipates. But now she's trapped, and while this spell isn't designed to bring your opponent closer, the magic is mighty, and is meant to hold someone in place--exactly what you wanted. Because not only can she now no longer move, but her situation has become more humiliating than before.

Her legs are spread apart, and her arms are far from being able to cover up. While the dress she wears may be quite bold and sexy, it's certainly not practical when your opponent can trap you in such a fashion. Usually she'd be wearing underwear of course, but this is not one of those times, so it's all on display. She stares down with a face burning red, but as she flails left and right, there doesn't seem to be any escape from this embarrassment. "Do not look! Do not!" she screams.

"Woooo!" Candy shouts in delight from behind you. "Hot stuff!"

"M-My lady--" Nelli turns in panic.

Anyana gasps with hands over her mouth. At the same time, arms over her naked bust. She's calmed down, at least somewhat, though has that problem to contend with.

You quickly swim up and over, placing a hand upon her cheek. "Surrender immediately and tell me what I need to know, or I'll unleash a Pleasure spell with every last bit of mana it can use."

"What kind of threat is that?!" she shouts, though she looks incredibly panicked. "Y-You would not do such a thing."

"I would. And I wonder. We're underwater, but could people still see how wet you'd become?"

"How dare you say such a thing!"

"How dare you endanger Nureteru. Now tell me why you've been seeding corruption. Are you planning a takeover?"

"... I cannot say. You are likely working for her, and you would not believe me."

"Leave Nureteru alone!"

"Not until the city is safe!"

You furl your bow. "Excuse me?"

"No, mistress. Do not." Nelli grips the shaft of her flail tight. "They mustn't know more, or else those we have in the palace may be in danger."

"We're literally here to save the city from your corruption," you say. "What do you mean by keeping the city safe?"

Gwynevere purses her lips and shakes, both with anger and continued humiliation. "If you cover up my private space, I will tell you," she whispers in hopes only you can hear.

You roll your eyes and grab onto part of her dress, closing the curtains on her bare pussy. "Is that better?"

"Y-Yes. Thank you."

"So tell me. Or another act is starting, and the curtains are opening again."

"You demon! I will not forget this!"

"Yeah. It's kind of in our titles. Now talk."