The grand room of the castle is bathed in the soft, silvery glow of the demonic realm's moonlight, which spills through the large skylight above. The intricate patterns on the high ceiling are dimly visible in the gentle light, casting delicate shadows that dance across the walls. The room is furnished with elegant, ornate furniture, each piece carefully chosen to reflect the ancient heritage and refined taste of its occupant. Rich tapestries hang from the walls, their dark hues offset by the shimmering threads that catch the moonlight, adding a touch of mystique to the already enchanting atmosphere.

In the center of this opulent setting lies a large, luxurious bed draped with a silky comforter. Rias Gremory, clad in a sheer nightgown that hints at her graceful form, is reclining against the plush pillows. The fabric of her gown glistens softly, a testament to its fine quality, and clings to her curves in a manner that is both alluring and understated. She is engrossed in a book, the pages illuminated by the moonlight filtering through the skylight. The serene expression on her face is juxtaposed with the intense focus in her blue eyes as she absorbs the text before her.

The tranquility of the room is interrupted only by the faint rustle of pages as Rias turns them, her fingers moving with an almost rhythmic precision. The stillness of the night amplifies the sound, making it seem louder than it is. Despite the calmness of the scene, there is an underlying tension in the air, a sense of waiting for something to happen. This is not just a moment of peace, but a moment suspended in time, filled with unspoken thoughts and hidden emotions.

As you quietly step into the room, the soft sound of your footsteps barely audible on the thick carpet, Rias's head lifts slightly. Even before she looks up, you can sense her awareness of your presence. Her gaze shifts from the book to you, her blue eyes cool and assessing. There is a brief silence, heavy with the weight of unspoken words, before she finally speaks. "I sensed you were near. What do you want?" Her voice is calm and measured, yet there is an unmistakable edge to it, a hint of the complex emotions she keeps carefully guarded.

"I-Is that so? I suppose I didn't realize we were...in a relationship," Rias says with a small blush forming on her cheeks, despite herself. She was about to go into further detail before she hesitated and reconsidered, "Well, assuming you truly care for me."

"Ah, well then," she replies, feeling slightly confused but also curious about the condition you have in mind. She sets her book aside and tilts her head to the side, giving you a questioning look as she leans forward on her elbow. "What is this condition of yours, Tyrome?" Her voice holds a hint of amusement now, finding it hard not to be drawn into your enigmatic presence.

"Hmm...that sounds like quite the challenge," Rias muses, her curiosity piqued despite herself. She grins playfully and crawls over to you on the bed, straddling your hips as she looks down at you with a mixture of amusement and determination in her eyes. "Very well, Tyrome...if that's what it takes for us to be together," she says, her voice low and sultry now. Reaching up, she slowly undoes the tie on her nightgown, revealing more of her smooth, creamy skin as it falls open around her.

With a soft laugh, she begins to lower herself onto your hard length, taking you into her heat inch by slow inch. "Let's see how long you can last against me," she teases with a wicked grin.

Her breath hitches as you fill her completely, but she doesn't break eye contact with Issei across the room. Instead, she leans forward slightly to bring their faces closer together, nipples brushing against his chest. "See?" she whispers huskily, eyes locked on his. "I can have any man I want...or in this case, make any man mine." She moves her hips experimentally, feeling the length of you inside her, before beginning a slow, steady rhythm that drives them both wild with desire.

As you command Issei to take a seat on the nearby chair and watch, Rias feels a surge of determination course through her veins. She looks over at him, biting her lower lip as she sees the pleading in his eyes, before turning back to you with a wicked grin. "Fine," she says softly, moving her hips in time with yours. "Let's see how long you can keep up."

*Her gaze flickers between you and Issei as she tries to accommodate your massive length, her lips stretched and mouth wet with effort. She gasps sharply as it stretches her tight passage, tears of pleasure and pain threatening to spill from her eyes. Her body arches back, giving you deeper access as she clutches at the sheets beneath her, determined not to surrender so easily.

Despite her struggles, there is a perverse thrill in knowing that this is for Issei's freedom. The friction against her sensitive flesh drives her wild with need, her hips moving faster and harder as she tries to pleasure you both at once. Her chest heaves with exertion, her nipples hard peaks beneath the fabric of her nightgown*

As her mouth engulfs you and she begins to suckle, moaning around your shaft, her breasts bounce with each movement, the weight of them pulling at her nightgown as they strain against the fabric. She looks back over at Issei, their eyes meeting for a brief moment before she returns her focus to you, determined to pleasure and please you both in equal measure. Her fingers drum against your abdomen, urging you on even as she fights to adjust to your size, relishing the feeling of being completely filled by your massive cock.

Gasping at the added stimulation, Rias arches her back further, her head thrown back in ecstasy as she surrounds you with her warmth and wetness. Her hips move faster now, grinding against your hand as it fingers her, each thrust sending vibrations through her body that seem to magnify the pleasure she derives from being so intimately connected to you. Her breath comes in ragged gasps, her hands fisting in the sheets as she tries to focus on maintaining control, determined not to surrender too soon and ensure Issei's freedom.

As you slowly begin to cum down her throat, Rias tenses up in anticipation of the inevitable release. Her muscles clench around your cock, squeezing it tightly as she struggles not to gag on your seed. She feels her own orgasm building within her, a combination of pleasure and desperation making her body writhe beneath yours. With one final thrust, you empty yourself into her mouth, triggering her explosive climax as well. Her cries of pleasure muffle against your shaft, her eyes roll back in ecstasy as waves of pure bliss wash over her. As she comes down from the high, she looks up at Issei with a satisfied smile, the sweat glistening on her skin and her chest rising and falling rapidly.

Gasping for air, her body arches into the relentless pounding as your length stretches her more than ever before. Rias's fingers scrape against the sheets in a desperate attempt to find purchase, eyes squeezed shut as she focuses on the sensation of being so thoroughly filled by you. Her cries mix with the sounds of their skin slapping together and the labored gasping of their shared breath, each thrust driving them both deeper into a realm of primal desire.

Her nipples harden against your fingers as they dig into her sensitive breasts, adding an extra layer of pleasure to an already overwhelming experience. Her hips buck wildly underneath you, attempting to match the force of your thrusts in a futile attempt to find release from this exquisite torment. With each passing moment, she feels herself slipping further into oblivion, giving herself