First time

The friction of Simon’s tongue was a delicious torture, but the masculine drive surging through Marissa’s veins demanded something more visceral than oral pleasure. The need to possess, to conquer, and to feel herself sliding into something warm and tight became an all-consuming roar in her ears.

"Enough," Marissa commanded, her voice a gravelly rumble that brooked no argument. She stepped back, freeing Simon’s mouth with a wet, popping sound. "Sucking it is a good start, but I’m not done with you. Get on the bed. Now."

Simon blinked, her eyes glazed and lips swollen, her mind swimming in a cocktail of submission and arousal. "Wait, what? I thought we were—"

"I didn't ask for your opinion," Marissa interrupted, her gaze dropping to Simon’s trembling thighs. "Get on all fours. Ass up. Now!"

Simon didn’t hesitate. The command acted like a physical tether, pulling her onto the mattress where she collapsed onto her hands and knees. Her spine arched, her chest dipping low as she pushed her hips high into the air, creating a desperate, inviting silhouette. She felt the cool air of the room hit her wetness, her pussy throbbing in a rhythmic, agonizing anticipation. She was a raw nerve of need, waiting for the impact.

Then came the collision.

Marissa didn’t slide in; she drove in. There was a sharp, visceral *slap* of pelvic bone hitting pelvic bone, a sound that echoed off the walls like a gunshot. The impact sent a shockwave through Simon’s entire frame, knocking the breath from her lungs in a jagged gasp. The sheer force of the entry was overwhelming, the girth of Marissa’s new cock stretching her vaginal walls to a point of exquisite tension.

*Slap. Slap. Slap.*

The rhythm was relentless, a primal percussion of skin meeting skin that drowned out everything else in the room. Each thrust was a conquest, driving Simon deeper into the mattress, forcing her breasts to sway and her head to toss. The sensation was a chaotic storm; where the dildo had been a static mountain, Marissa was a living, breathing engine of pressure. Simon felt herself being dismantled, her identity as the "big brother" dissolving with every rhythmic thud. She found herself craving the very dominance that was crushing her, her mind spiraling into a haze where the only thing that mattered was the weight of Marissa pressing her down.

"Is this what you wanted?" Marissa groaned, her voice a low, guttural vibration that Simon felt in her own marrow. "You wanted the real thing, didn't you?"

Simon couldn't answer. Her voice had been reduced to a series of high, needy whimpers and broken moans, each one punctuated by the wet, rhythmic *slap-squelch* of their bodies collidinng. "Aaaa-hnn! Oh god, *nghh!*" she cried out, her fingers digging into the bedsheets as her back arched like a bow. The sounds coming from Marissa were different—low, guttural grunts of exertion and raw satisfaction. "*Hmph... yes... just like that... fffuuuck!*" Marissa groaned, the sound vibrating deep in her chest and echoing through Simon’s spine.

As the intensity peaked, the sheer friction began to overwhelm Simon. The pleasure was crossing the line into something almost too much to bear, a sensory overload that made her head spin. "Wait... *ah!* Stop... please, just—*nnngh!*" Simon gasped, her voice cracking. She tried to shift her hips, a desperate attempt to find a momentary reprieve from the relentless pounding.

But the request only seemed to fuel the fire in Marissa’s veins. The masculine drive of the wish had replaced her sisterly tenderness with a commanding, territorial hunger. Marissa leaned forward, her chest pressing against Simon’s back, her hand gripping Simon’s hip with a bruising intensity to keep her pinned.

"Stop?" Marissa chuckled, the sound a dark, resonant rumble against Simon's ear. "You don't get to tell me when to stop. Not when you're shaking like this." She delivered a particularly deep thrust that forced a strangled *“Ghhkk!”* from Simon’s throat. "If you want me to slow down, you have to ask properly. Call me 'Daddy.' Tell me you need your Daddy to finish the job."

Simon’s face burned, a mix of shame and an electric, forbidden excitement surging through her. The word felt alien, wrong, and yet, in the heat of the moment, it felt like the only key that could unlock the pleasure she was chasing. She let out a sob of surrender, her head lolling to the side. "Please... *nnngh*... Daddy... please!" she whimpered, the word tasting like a surrender of everything she used to be. "Don't stop... I need it... please!"

The admission acted like a catalyst. Marissa let out a roar of triumph, her movements becoming faster and more erratic. The *slap-slap-slap* of their pelvises grew frantic, a blurred cacophony of wet friction and desperate gasps. Simon felt the world narrowing down to a single point of contact, the irresistible pressure of Marissa’s cock driving her toward a precipice.

The friction became a blur of white heat, a searing current that drowned out the room and the world. As Marissa’s rhythm reached a fever pitch, Simon realized with a sudden, jarring clarity that the dildo had been a crude rehearsal. That cold, static plastic had been a ghost; this was the living truth.

There was a terrifying, beautiful symmetry to it—the way her internal walls clung to the pulsing warmth of the shaft, the way her body seemed to mold itself around Marissa with a precision that felt ancient, as if her new female anatomy had been designed specifically for this exact intrusion. She wasn't just being filled; she was being completed.

The sensation surged upward, coalescing into a blinding knot of tension at the center of her being. Simon felt her breath vanish, her lungs locking as a tidal wave of pleasure crashed through her. It wasn't the sharp, localized snap of her former life, nor the soft, rolling waves of her first girl-orgasm. This was a total systemic collapse.

As Marissa delivered a final, crushing thrust, Simon’s pussy clamped down in a series of violent, rhythmic spasms. She let out a scream that was lost against the mattress, her entire body vibrating with an intensity that felt like it might actually tear her apart. Her first true female orgasm didn't just ripple; it exploded, a supernova of feeling that left her vision sparking and her muscles twitching in a state of absolute, shattered surrender.

As the echoes of Simon’s scream faded into a series of shuddering breaths, the air remained heavy with the scent of sweat and musk. Marissa didn't withdraw immediately. Instead, she lingered in the afterglow, her chest heaving against Simon’s back, her heartbeat hammering a frantic rhythm against her skin. In the haze of her own peak, Marissa's eyes caught the glint of the gold coin resting on the nightstand, forgotten in the chaos. With a sudden, opportunistic lung, she snatched it from the wood.

The masculine drive hadn't subsided; it had evolved into a territorial instinct. She didn't just want the act; she wanted a permanent mark of her dominance. While Simon was still limp and twitching in the throes of her orgasm, Marissa gripped the coin tight. "I WISH SIMON GETS PREGNANT FROM MY SEED!" she commanded, her voice a gravelly, authoritative rumble.

Simon, barely conscious and floating in a sea of endorphins, felt the coin leave Marissa’s hand. The magic of the ritual surged through her, compelling her to wish for the most recent sexy thing she had craved. In the same moment Marissa had wished for the seed, Simon had been imagining the ultimate power over her own pleasure—the ability to choose exactly when that seed took hold, turning the act of conception into a conscious, erotic trigger.

"I WISH I CAN ONLY GET PREGNANT WHEN I DECIDE TO!" Simon gasped, her voice a fragile, high-pitched whisper.