Roughly

Natalie took the panties that Casey had given her and stalked around to the back of the anxious girl. She could almost sense Casey straining to see her, the younger woman's heartbeat racing. Her own heartbeat was racing as well. She didn't know quite what to do, or rather, she'd not often been on this side of things. Instead, she'd often been the one being exposed or stripped or humiliated. She didn't how far to go, but she did know that she felt a rising arousal, a tingling between her legs that grew stronger the more she thought about all the things that she could do to Casey.

You wanted to be punished? Well, we'll see how far it goes.

"Hands out, behind your back." Casey's fingers clenched as she did what she was asked, thrusting her hands behind her back. The skin of her arms was pale, and she shivered as she felt Natalie's fingers closing around her wrists. Natalie took the panties that Casey had been wearing, and started to twist them into the shape of a rope, which she used to tie Casey's arms behind her back. The younger girl shuddered a she felt the knot pull tight, Natalie didn't know if she could escape, probably so. Panties were not renowned for their use as a rope, after all. But it didn't matter. What mattered was the feeling.

She moved around again, coming face to face with Casey, whose arms were now secured behind her back. The younger girl was flushing more heavily now, the feeling of being restrained made everything feel more real to her. Natalie looked down, searing her womanhood for the hint of arousal she knew had to be there.

"You're tied up with your own panties." Natalie said. "Do you feel how wet they are, Casey? You must have been thinking about this for a long time, weren't you? You said that you had a bath before you came here... did you sit in the tub wondering what I might do to you? Did it get you all hot and bothered?"

Natalie's hand reached out, grabbing Casey by the chain, her fingers closing around the other girl's jaw. Casey's skin felt warm and excited, her eyes were shaded green, with a deep desire that burned within them. She was breathing heavily, anticipation edging her thoughts. Natalie could feel her own arousal swelling. A tightness between her legs and a heat spreading through her womanhood. Fuck, was she really ready to go again? Even after earlier? But, the idea that Casey was open to her, willing to let her do anything at all fired Natalie's lust. It made her clit tingle, and her heart beat faster.

"Did you touch yourself in the bath thinking about this? Answer me, Casey."

"N-No!" Casey said, her voice trembling. "I didn't touch myself, Natalie, I swear! I just... I felt like you deserved to punish me for what I'd done!"

"Not because it turns you on to be punished like this?" Natalie asked her.

"N-No, I don't like this at all..."

Natalie grinned, she moved forwards, brushing the girl's face with her hair as she edged her mouth towards her ear. Casey trembled as she felt Natalie's closeness, the heat of her body, her mouth pressed against the sensitive skin of her ear.

"Liar." Natalie whispered to her. "Do you think I can't see just how eager you are, Casey? Just how wet you are? Admit it, you want to be punished."

"No!" Casey shook her head. "I don't! I'm not...I'm not like that!"

"You're standing here naked, Casey, your arms tied with your own panties, and you're not like that? I find that a little hard to believe. Get on your knees."

"N-Natalie?"

"You heard me, Casey. You wanted to be punished, right? This is how it goes. Get on your knees, and service me with your tongue. Make me feel good the way I made you feel before."

Natalie felt her womanhood grow wetter, the heat between her legs growing as Casey sunk to the ground, bending her knees so that she was kneeling. Her emerald eyes were wide, her face red, her breasts were pressed forwards thanks to the way her hands were bound behind her back, her nipples clearly engorged. Natalie stepped forwards, thrusting her womanhood into Casey's face, and the other girl started to act.

Natalie felt Casey's tongue, warm and wet, as it played along the entrance to her womanhood, the feeling of Casey's breath on her pubic mound tickled her, the heat of her nearness made her blood run hot. Casey was uncertain at first, she'd never done anything like this before, her tongue was clumsy and slow. Nonetheless, its touch left a tingling wake, making Natalie breath quickly. Feeling another woman between her legs awoke feelings in her, it was very different from being the one who was doing it! Casey's hot breath tickled her mound, Casey's tongue penetrated her lower lips, Natalie moaned softly. Her womanhood was still tender from the punishment she'd gotten before, it was tingling intensely as a result of both of that and its current treatment. Natalie licked her lower lips, thrusting her womanhood forwards as she felt Casey get to work, the other girl's tongue licked and teased her entrance, before diving deeper, Natalie felt the heat building up between her legs, her nipples tingled, her skin was becoming sensitive.

Casey started to move faster, rapid motions with her tongue made Natalie tremble, a hand rose to her mouth, as if trying to prevent herself from moaning. Her breathing was getting faster now, her nerves were starting to light up, electricity running through her skin as Casey pleasured her with her mouth. Natalie shifted in place, moving on the balls of her feet. A tightness between her legs was growing now. Natalie grabbed the back of Casey's head with her two hands, forcing her forwards, making her go deeper. She groaned, and her back arched, Casey's tongue driving her into a state. The other woman was much more confident in her actions now, she wasn't just licking, but seemed to have a solid plan, she teased and probed, running her tongue over Natalie's womanhood, testing and checking to find where she was sensitive. When Natalie had no reaction, she moved on, but when Natalie moaned, or flinched, or otherwise reacted, Casey knew to target that place again, flooding the other woman with pleasure that slowly built up over time.

Suddenly, Natalie felt the strength leave her legs, as if a spike had been driven through her spine, or a jolt of lightning had raced through her body. A surge of heat, followed by a wave of pleasure and shock told her that Casey had found her clit. Natalie's eyes opened wide. Fuck! It felt so good! She hadn't expected Casey to know what to do, but she realised Casey was only copying what she had done to her before. Now that she had found her target, Casey attacked it ruthlessly, her tongue teasing the nub of flesh, stroking it, almost gently. She jabbed it with the head of her tongue, making short, sharp repeated contacts which made Natalie's world go white, and shook her very bones.

Natalie came a moment later, staggering backwards to the bed, and half collapsing onto it as she felt her pussy firing with pleasure. Her muscles shook, and she breathed heavily, holding herself together until the climax had passed. Only then did she look back, seeing Casey still kneeling, her hands tied with her own panties, and her face smeared with Natalie's juices. Her eyes were closed, and she was blushing, but Natalie sensed something within her, as if a new world had opened up.