parameters


txt2img: 

(duo, anthro, 2boys), furry, male, sitting, bedroom, age difference, naked, sex, anal sex, BREAK,
anthro, border collie, male, young adult, (blue eyes), black and white fur, sheath, canine penis, balls, knot, pink paw pads, licking younger brother's cheek, BREAK,
anthro, border collie, male, cub, young, teen, (brown eyes),, black and white fur, pink paw pads, sheath, canine penis, balls, BREAK,
masterpiece, best quality, amazing quality, very aesthetic, high resolution, absurdres, newest, scenery, ultra-detailed, detailed eyes, detailed fur, dynamic lighting, 8k, HDR, ultra-HD, highly detailed, 8k, HDR, realism, realistic, <lora:StS-Illustrious-Detail-Slider-v1.0:3>
Negative prompt: human, (worst quality, bad quality:1.2), lowres, low quality, bad quality, bad male anatomy, bad female anatomy, grainy, noisy, render, filmgrain, text, deformed, disfigured, human penis, (female), (breasts), abs, extra fingers, bad anatomy, extra fingers, white background, black background, signature, patreon, web address, humanoid penis, text, feral, blurry, faded, antique, muted colors, greyscale, boring colors, flat, bad photo, terrible 3D render, black and white, glitch, cross-eyed, lazy eye, ugly, distorted, glitched, lifeless, bad proportions, watermark, window, human penis, vagina, letters, cords,
Steps: 40, Sampler: Euler a, Schedule type: Karras, CFG scale: 5, Seed: 806554412, Size: 976x752, Model hash: 5901b6dd1e, Model: novaFurryXL_illustriousV50, Lora hashes: "StS-Illustrious-Detail-Slider-v1.0: 2e7a68ec7e2e", 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-659-gc055f2d4

Then img2img:

(duo, anthro, 2boys), furry, male, sitting, bedroom, age difference, naked, sex, anal sex, BREAK,
anthro, border collie, male, young adult, (blue eyes), black and white fur, sheath, canine penis, balls, knot, pink paw pads, licking younger brother's cheek, BREAK,
anthro, border collie, male, cub, young, teen, (brown eyes),, black and white fur, pink paw pads, sheath, canine penis, balls, BREAK,
masterpiece, best quality, amazing quality, very aesthetic, high resolution, absurdres, newest, scenery, ultra-detailed, detailed eyes, detailed fur, dynamic lighting, 8k, HDR, ultra-HD, highly detailed, 8k, HDR, realism, realistic, <lora:StS-Illustrious-Detail-Slider-v1.0:3>
Negative prompt: human, (worst quality, bad quality:1.2), lowres, low quality, bad quality, bad male anatomy, bad female anatomy, grainy, noisy, render, filmgrain, text, deformed, disfigured, human penis, (female), (breasts), abs, extra fingers, bad anatomy, extra fingers, white background, black background, signature, patreon, web address, humanoid penis, text, feral, blurry, faded, antique, muted colors, greyscale, boring colors, flat, bad photo, terrible 3D render, black and white, glitch, cross-eyed, lazy eye, ugly, distorted, glitched, lifeless, bad proportions, watermark, window, human penis, vagina, letters, cords,
Steps: 40, Sampler: DPM++ 3M SDE, Schedule type: Karras, CFG scale: 5, Seed: 3180488341, Size: 2240x1728, Model hash: 5901b6dd1e, Model: novaFurryXL_illustriousV50, Denoising strength: 0.5, Lora hashes: "StS-Illustrious-Detail-Slider-v1.0: 2e7a68ec7e2e", Version: f2.0.1v1.10.1-previous-659-gc055f2d4

Then some photoshop and coloring work, with some inpainting. Inpaint settings: 

Steps: 40, Sampler: DPM++ 3M SDE, Schedule type: Karras, CFG scale: 5, Seed: 4026231291, Size: 2240x1728, Model hash: 5901b6dd1e, Model: novaFurryXL_illustriousV50, Denoising strength: 0.45, Mask blur: 4, Lora hashes: "StS-Illustrious-Detail-Slider-v1.0: 2e7a68ec7e2e", Version: f2.0.1v1.10.1-previous-659-gc055f2d4

Finally, upscaled: 

postprocessing

Postprocess upscale by: 1.1, Postprocess upscaler: R-ESRGAN 4x+ Anime6B