I used NovelAI's unlimited gen membership for $25 a month. Note that "unlimited" is kind of a lie, it's only unlimited if you're under a certain resolution and only if you're not using any of the advanced features. Upscaling and other features cost the on-site currency, which the membership gets you 10000 a month. That should be more than enough for a month, but you can burn through it quickly since NAI gens so quickly.

Krystal’s colossal amazonian frame loomed like a living goddess of muscle and curves, her sapphire-blue fur shimmering under the dappled jungle sunlight as she crushed Wolf O’Donnell into the soft, pillowy sanctuary of her gigantic breasts. The golden bandeau top strained obscenely against the impossible swell of her chest, the golden thong of her tiny top barely containing the two overflowing orbs that rose and fell with every triumphant breath. Each massive, heavy mound of flesh was bigger than Wolf’s entire torso—warm, velvety, and impossibly soft yet radiating raw, throbbing power. Sweat beaded across her glistening white underbelly and abs that could crack steel, her thick, powerful thighs flexing as she planted one clawed foot on the mossy ground, the other hooked behind Wolf’s back for leverage. The forest air crackled with heat, the distant calls of birds and the rustle of leaves mixing with the wet, rhythmic smack of skin on skin and the heavy, labored panting of both anthros.

Wolf’s gray-and-white muzzle was buried face-first between her colossal globes, his nose pressed deep into the warm valley where her cleavage met her abs. The scent hit him first—raw, primal, a mix of jungle musk, her own spicy arousal, and the faint copper tang of her sweat. Her skin was silken yet impossibly hot, her nipples stiff and pebbled against his cheek as they dragged across the fabric of his black Star Wolf jacket. His heart hammered like a drum, every frantic breath only driving him deeper into the plush, smothering softness that smelled like sex and victory.

“Guh—! Krystal, you massive, sexy beast—!” Wolf snarled, voice muffled and cracking as he shoved with both gloved paws against the unyielding wall of titflesh. His fingers sank in only inches before springing back, unable to gain purchase on her impossible size. “I said—ugh!—break free, you giant fucking amazon! My arms are shaking, but I—fuck—!”

Krystal’s emerald eyes sparkled with smug, wicked delight as she laughed, a deep, throaty sound that vibrated straight through her chest and into Wolf’s bones. The rumble made her breasts jiggle like two heavy water balloons, the golden thong of her bandeau slipping slightly to reveal the deep, shadowed cleft between them. She tightened the headlock with one massive blue-gloved hand, fingers splayed possessively over the back of his head, while the other rested casually on her wide, flaring hip. Her white loincloth hung low on her hips, the hem fluttering against the top of her thick thighs, the air beneath it warm and moist with her own building heat.

“Ohhh, look at you, little Wolfie,” Krystal purred, her voice husky and playful, each word sending a warm puff of breath against Wolf’s forehead. “Struggling so hard against these big, heavy tits… they’re so soft and warm and way too big for you to handle, aren’t they? Feel that? That’s all you. All yours. Or… well… mine. Kinda.” She flexed her arms deliberately, making her biceps bulge like steel cables beneath her blue fur, the veins standing out in sharp relief. Her gigantic breasts swayed heavily with the motion, the weight so immense she had to adjust her stance, one clawed foot sliding in the dirt to keep her balance. The forest floor trembled faintly from her power.

Wolf’s face burned crimson, sweat pouring down his muzzle as he pressed harder, claws digging into the impenetrable curve of her tit. “This isn’t—hngh!—funny! You’re so fucking strong, Krystal, I can’t—! My arms are gonna snap but—goddamn it, your chest is so warm and soft and—!” His voice hitched as a sudden, traitorous jolt shot through him. Her breasts were so close, so heavy, so perfectly molded to his face that his cock—already half-hard from the pressure—lurched to full, aching stiffness. The thick, throbbing length of his wolfish shaft strained violently against the black fabric of his pants, the zipper straining audibly, a visible wet spot blooming at the front. Every heartbeat made it throb harder, the bulge pushing outward like a tent pole aimed straight at her cleavage.

Krystal’s smile widened into a wicked grin, her green eyes narrowing with playful lust. She leaned in slightly, pressing her enormous breasts even tighter around Wolf’s head, the warm, pillowy weight smothering him completely. “Mmmph~! There it is! I felt that twitch against my belly! Look at you, big bad Wolf O’Donnell, getting a massive boner from a girl’s tits! So funny… so pathetic… and so fucking sexy.” She reached down with her free hand, claws lightly tracing the rigid outline of his stretched pants, the touch feather-light yet electric. The pressure of her fingertip made the bulge jump again, another bead of precum soaking through the fabric with a soft, wet sound. “Feel how hard you are? That’s all because of me. All this power… this massive body… these huge, bouncy tits that could crush a tank but only make you leak for them instead.”

Wolf groaned, the sound vibrating against her cleavage as he tried one last desperate shove. “S-Shut up—! I’m not—ugh—! Your breasts are way too big, Krystal, they’re smothering me and—ahh!—your smell is driving me crazy! The sweat… the heat… your tits are so warm and heavy and I can’t—!” His hips jerked involuntarily, grinding his aching cock against the underside of her abs in a futile, desperate rhythm. Sweat flew from both of them, mixing in the humid jungle air. The distant roar of a distant pterosaur echoed through the trees, barely audible over the wet slap of Wolf’s struggling body against her colossal form.

Krystal tilted her head back, laughing again, her long blue hair cascading like a waterfall down her back. She released just enough pressure to let Wolf’s face pop up for air, but only to grin down at him with pure, arrogant affection. “Aww, poor little Wolfie’s getting all flustered and horny from the world’s biggest amazon titted vixen putting him in a headlock. You’re so cute when you’re red-faced and leaking like that.” She gave her breasts a playful bounce, the sheer mass making them slap softly against each other with a meaty, squelching sound. The jiggle sent another wave of heat through Wolf, his cock twitching violently in his pants, the front now visibly outlined against the fabric.

“P-Please… Krystal… I can’t—your tits are too big, too soft, too perfect,” Wolf panted, voice hoarse and broken, one hand weakly trying to push her away while the other fisted the front of her blue armor. “I’m gonna—ngh!—I’m gonna blow right through my pants if you keep bouncing like that…”

Krystal’s emerald eyes sparkled with mischief and raw, teasing lust. She finally loosened her grip just enough for Wolf’s head to tilt up, but not enough for him to break free. Instead, she leaned forward, letting her gigantic breasts rest heavily atop his head once more, the warm, pillowy pressure forcing his face back into that perfect valley of cleavage. Her voice dropped to a sultry whisper right against his twitching ear, breath hot and sweet.

“Mmm, good boy. You’re not getting out of this headlock until I say so… and maybe not even then. These massive, muscular tits are gonna keep you pinned and leaking for me all day. Now… tell me how much you love being crushed between the world’s biggest, sexiest amazon tits, Wolfie~”

Wolf’s only answer was a helpless, garbled moan, his cock throbbing painfully hard against the soaked fabric of his pants while Krystal’s colossal body simply held him there, laughing softly as the jungle heat wrapped around them both in a haze of sweat, musk, and overwhelming, erotic power.