parameters

furry, duo, barn, anal sex, sex, cub, young, (knotting), knotted, on side, BREAK,
anthro, (blue fox), blue fur, young, (cub), blue eyes, naked, erection, canine penis, knot, balls, open mouth, panting, collar, BREAK,
anthro, (black fox), black fur, young, (cub), red eyes, naked, balls, sheath, canine penis, knot, pleasure, orgasm face, BREAK,
masterpiece, best quality, amazing quality, very aesthetic, high resolution, absurdres, depth of field, newest, scenery, ultra-detailed, detailed eyes, detailed fluffy fur, dynamic lighting, 8k, HDR, ultra-HD, highly detailed, HDR, realism, realistic, photorealism, photorealistic, realistic lighting, caustic shadows,
Negative prompt: leash, long torso, worst quality, bad quality, lowres, low quality, bad male anatomy, bad female anatomy, grainy, noisy, render, filmgrain, text, deformed, disfigured, female, breasts, abs, extra fingers, bad anatomy, signature, patreon, web address, text, feral, blurry, faded, antique, muted colors, greyscale, boring colors, flat, bad photo, terrible 3D render, glitch, cross-eyed, lazy eye, ugly, distorted, glitched, lifeless, bad proportions, watermark, window, human penis, vagina,
Steps: 40, Sampler: Euler a, Schedule type: Karras, CFG scale: 5, Seed: 1362624078, Size: 1016x1016, Model hash: cab478b74a, Model: novaFurryXL_illustriousV100, 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


Blah blah, coloring this and that, blah blah, txt2img: 

parameters

furry, duo, barn, anal sex, sex, cub, young, (knotting), knotted, on side, BREAK,
anthro, (blue fox), blue fur, young, (cub), blue eyes, naked, erection, canine penis, knot, balls, open mouth, panting, collar, BREAK,
anthro, (black fox), black fur, young, (cub), red eyes, naked, balls, sheath, canine penis, knot, pleasure, orgasm face, BREAK,
masterpiece, best quality, amazing quality, very aesthetic, high resolution, absurdres, depth of field, newest, scenery, ultra-detailed, detailed eyes, detailed fluffy fur, dynamic lighting, 8k, HDR, ultra-HD, highly detailed, HDR, realism, realistic, photorealism, photorealistic, realistic lighting, caustic shadows,
Negative prompt: leash, long torso, worst quality, bad quality, lowres, low quality, bad male anatomy, bad female anatomy, grainy, noisy, render, filmgrain, text, deformed, disfigured, female, breasts, abs, extra fingers, bad anatomy, signature, patreon, web address, text, feral, blurry, faded, antique, muted colors, greyscale, boring colors, flat, bad photo, terrible 3D render, glitch, cross-eyed, lazy eye, ugly, distorted, glitched, lifeless, bad proportions, watermark, window, human penis, vagina,
Steps: 40, Sampler: DPM++ 3M SDE, Schedule type: Karras, CFG scale: 5, Seed: 2513645754, Size: 2032x2032, Model hash: cab478b74a, Model: novaFurryXL_illustriousV100, Denoising strength: 0.45, Version: f2.0.1v1.10.1-previous-669-gdfdcbab6

Lots of inpainting, and coloring/fixes in Paint.NET. After everything, upscaled: 

Postprocess upscale by: 1.4, Postprocess upscaler: 8xNMKDSuperscale_150000G