Nick and Just Standing 1: 

txt2img:
parameters

anthro, furry, duo, m/f, male/female, outside, detailed background, nighttime, night, size difference, BREAK,
anthro, fox, nick wilde, zootopia, naked, disney, green eyes, canine sheath, canine penis, balls, mouth open, panting, sweating, BREAK,
anthro, bunny, rabbit, Judy hopps, zootopia, naked, pain, pleasure, BREAK,
masterpiece, best quality, amazing quality, very aesthetic, high resolution, absurdres, depth of field, newest, scenery, ultra-detailed, detailed eyes, (detailed fluffy fur:1.5), dynamic lighting, 8k, HDR, ultra-HD, highly detailed, HDR, realism, realistic, realistic lighting, caustic shadows, cinematic lighting, BREAK, sex, vaginal penetration, against tree, knotting, knotted,
Negative prompt: belly bulge, brown fur, (worst quality, bad quality:1.2), lowres, low quality, bad male anatomy, bad female anatomy, grainy, noisy, render, filmgrain, text, deformed, disfigured, abs, extra fingers, bad anatomy, signature, patreon, web address, text, blurry, faded, antique, muted colors, greyscale, boring colors, bad photo, terrible 3D render, glitch, cross-eyed, lazy eye, ugly, distorted, glitched, lifeless, bad proportions, watermark, window, human penis,
Steps: 30, Sampler: Euler a, Schedule type: Karras, CFG scale: 5, Seed: 1212984917, Size: 1024x1024, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Variation seed: 2373766278, Variation seed strength: 0.1, freeu_enabled: True, freeu_b1: 1.01, freeu_b2: 1.02, freeu_s1: 0.99, freeu_s2: 0.95, freeu_start: 0, freeu_end: 1, Version: f2.0.1v1.10.1-previous-669-gdfdcbab6

then img2img after some edits: 

parameters

anthro, furry, duo, m/f, male/female, outside, detailed background, nighttime, night, size difference, BREAK,
anthro, fox, nick wilde, zootopia, naked, disney, green eyes, canine sheath, canine penis, balls, mouth open, panting, sweating, BREAK,
anthro, bunny, rabbit, Judy hopps, zootopia, naked, pain, pleasure, BREAK,
masterpiece, best quality, amazing quality, very aesthetic, high resolution, absurdres, depth of field, newest, scenery, ultra-detailed, detailed eyes, (detailed fluffy fur:1.5), dynamic lighting, 8k, HDR, ultra-HD, highly detailed, HDR, realism, realistic, realistic lighting, caustic shadows, cinematic lighting, BREAK, sex, vaginal penetration, against tree, knotting, knotted,
Negative prompt: ((belly bulge)), brown fur, (worst quality, bad quality:1.2), lowres, low quality, bad male anatomy, bad female anatomy, grainy, noisy, render, filmgrain, text, deformed, disfigured, abs, extra fingers, bad anatomy, signature, patreon, web address, text, blurry, faded, antique, muted colors, greyscale, boring colors, bad photo, terrible 3D render, glitch, cross-eyed, lazy eye, ugly, distorted, glitched, lifeless, bad proportions, watermark, window, human penis,
Steps: 30, Sampler: DPM++ 3M SDE, Schedule type: Karras, CFG scale: 5, Seed: 4037604545, Size: 2048x2048, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Denoising strength: 0.45, Mask blur: 4, freeu_enabled: True, freeu_b1: 1.01, freeu_b2: 1.02, freeu_s1: 0.99, freeu_s2: 0.95, freeu_start: 0, freeu_end: 1, Version: f2.0.1v1.10.1-previous-669-gdfdcbab6

Followed by a bit of inpainting and upscaling: 

Postprocess upscale by: 1.5, Postprocess upscaler: 8xNMKDSuperscale_150000G