Spoiler (click to show/hide):
Initially oblivious to all but the feeling of emptying his hefty load into your rear, the copious release adding to the bulge his thick inhuman cock was already pushing into the shape of your gut as you dangled off of his shaft, Ishiwata lets out a contented sigh as he basks in the glow of his climax. His powerful, inhuman hands touch you with something that skirts closer than expected to gentle softness for a few moments as he feels up the shape of your form while you feel his hot and heavy body press against your back as he takes rest from his brutal pounding of your behind. His cock still throbs within you as he murmurs out contented grunts, letting his tongue out to slide against your cheek in a long, possessive and predatory lick.
"Good work, slut. You handle yourself like a proper- hyugk... urggh..."
His eyes widen, his grip on your body tightening. Suspended as your are on his shaft, your legs left dangling in the air, you feel yourself shaking from the buckling within Ishiwata's knees. He doubles over, reaching out to steady himself against the wall and almost folding you in half on his cock in the process. If her were to turn violent now, he might still have the physical strength to snap you like a twig - though it would still be too late.
He feels more than just his seed being drained into you. The clenching of your post orgasmic ass is joined by another, less pleasant sensation of ringing him dry. "Wh-what are you... Grrk..." Ishiwata is not able to fully form his questions, the surprise and discomfort leaving him impaired. In not too long, his mighty form begins to diminish, the reddish hue of his skin paling once more. You feel his cock begin to shrink down within you. Though he had still pumped enough cum within you to leave you looking pregnant with his child, its not long before his cock is reduced to a more normal human scale. With the absence of his strength and the thick rod leaving your skewered in the air, you fall back against him as he lets out an enraged roar. Much like his strength and size, the roar is quickly diminished into a quiet whimper, almost effeminate as Ida's more gentler tones return to his throat.
Freshly dispossessed, the musician collapses onto the floor and you fall with him, his cock still balls deep within you though small enough now to allow your ass a chance to relax as a puddle of Ishiwata's seed spills out and forms around both your thighs. You hear his heavy breathing beneath you as his eyes roll back in his head, occasional wordless murmurs denoting his clear and current daze.
Then, as if spreading out from the point where Ida's cock was lodged within your ass, a rapid change spreads across the room like a spiderweb of shadows that part to reveal the world as it should be. Like paint fading and flaking from wood before your very eyes, the pristine visage and warm light of the Blossom Garden is torn away to reveal the decrepit, cold and dark place you knew it to be from the outside. All that remained was the shrine that had been set up in this room, the candles unlit and now stained with your own release still dripping fresh across its form and the load Ishiwata left behind, which now swirls within you with not just seed but also his essence, churning with tethered rage as he tries with impotent fury to resist the binding you have begun. He may have fashioned himself an Oni, but the feeling within you was all too weak and pitiful to have ever been close to such an entity. This was a young and pathetic spirit, feeding more off the power of a place than of its own strength, and now it found itself at your mercy.
Ida's groans grow more coherent as he starts to try and sit up, stopping only once his chest presses against the soft of your back. "Oh?" he murmurs out, blinking the focus back into his eyes as he sees you and manages to lift one hand to brush some of your long hair over your shoulder so he may get a better look at your face. You feel his cock, despite all the tribulations it had been through, stiffen within you once more as a blush comes to his cheeks, before he looks around in awe.
"Is... is it over.... Did... did you save me? Am I free?" he asks. Before you have a chance to answer, he throws his arms around you, holding you in a tight embrace. It might be somewhat heart-warming if it didn't come with the side effect of feeling him thrust into you and stir around some of Ishiwata's load in the process. "Thankyou! Oh thankyou! I will never forget this!" he says, arms shaking as they grip onto you as if you were his only tether to life. Which, as of right now, you might just be.
This moment is short lived, however, as a shrill, ethereal shriek runs through the halls. A biting chill travels through opening shoji and torn walls, carried with the cry until it reaches you. Ida gulps down as this new female voice cries out "What has he done to my Garden?".
The anguish in her tone soon makes way to not more furious screeches, but instead a more sombre and mournful sobbing which carries itself slowly yet consistently throughout the hallways of the Garden.