Fin Locker room 

In all cases, Paint.NET was used for editing, and inpainting followed img2img. 

Underwear: 

txt2img: 

furry, anthro, solo, locker room, blue lockers, bench, changing, shirtless, dark blue underwear, white waistband, foot on bench, BREAK,
anthro, border collie, cub, young, black and white fur, blue eyes, black fur, 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, realistic lighting, caustic shadows,
Negative prompt: white hair, (worst quality, bad quality:1.2), 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: 2178741523, Size: 904x1112, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, 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 edits, coloring, etc. 

then img2img: 

furry, anthro, solo, locker room, blue lockers, bench, changing, shirtless, dark blue underwear, white waistband, foot on bench, BREAK,
anthro, border collie, cub, young, black and white fur, blue eyes, black fur, looking at viewer, (((bulge, spread legs))), 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, realistic lighting, caustic shadows,
Negative prompt: white hair, (worst quality, bad quality:1.2), 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: 3929919525, Size: 1752x2200, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Denoising strength: 0.6, 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

Then lots of inpainting, editing, etc. 

Then 

Postprocess upscale by: 1.4, Postprocess upscaler: 8xNMKDSuperscale_150000G
--------------

Sheath:

txt2img: 
furry, anthro, solo, locker room, bench, naked, BREAK,
anthro, border collie, cub, young, lithe, black and white fur, blue eyes, sheath, balls, penis tip, canine penis, 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, realistic lighting, caustic shadows,
Negative prompt: (worst quality, bad quality:1.2), 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: 1136028237, Size: 904x1112, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, 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


img2img:
furry, anthro, solo, locker room, blue lockers, bench, naked, BREAK,
anthro, border collie, cub, young, lithe, black and white fur, blue eyes, sheath, balls, penis tip, canine penis, 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, realistic lighting, caustic shadows,
Negative prompt: (worst quality, bad quality:1.2), 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: 1136028237, Size: 1856x2264, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Denoising strength: 0.45, 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 lots of inpainting, editing, etc. 

Then 

Postprocess upscale by: 1.4, Postprocess upscaler: 8xNMKDSuperscale_150000G
--------------

Touching Cock:

txt2img: 
furry, anthro, solo, locker room, bench, naked, BREAK,
anthro, border collie, cub, young, lithe, black and white fur, blue eyes, sheath, balls, penis tip, canine penis, (touching sheath), 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, realistic lighting, caustic shadows,
Negative prompt: (worst quality, bad quality:1.2), 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: 2536770536, Size: 904x1112, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, 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


img2img:

furry, anthro, solo, locker room, bench, naked, BREAK,
anthro, border collie, cub, young, lithe, black and white fur, blue eyes, sheath, balls, penis tip, canine penis, (touching sheath), 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, realistic lighting, caustic shadows,
Negative prompt: (worst quality, bad quality:1.2), 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: 3760160399, Size: 1808x2224, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Denoising strength: 0.45, Version: f2.0.1v1.10.1-previous-669-gdfdcbab6


Then lots of inpainting, editing, etc. 

Then 

Postprocess upscale by: 1.4, Postprocess upscaler: 8xNMKDSuperscale_150000G
--------------

Ass:

txt2img: 
furry, anthro, solo, locker room, bench, naked, BREAK,
anthro, border collie, cub, young, lithe, black and white fur, blue eyes, sheath, balls, canine penis, bent over, anus, 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, realistic lighting, caustic shadows,
Negative prompt: (worst quality, bad quality:1.2), 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: 3738315610, Size: 1000x1000, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Variation seed: 1431859278, 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


img2img:

furry, anthro, solo, locker room, blue lockers, bench, naked, (mouth open), (panting), pink paw pads, precum, leaking precum , BREAK,
anthro, border collie, cub, young, lithe, black and white fur, blue eyes, sheath, balls, canine penis, bent over, anus, 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, realistic lighting, caustic shadows,
Negative prompt: (worst quality, bad quality:1.2), 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: 2320916539, Size: 2008x2016, Model hash: 4b7db59db3, Model: novaFurryXL_ilV120, Denoising strength: 0.45, 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 lots of inpainting, editing, etc. 

Then 

Postprocess upscale by: 1.4, Postprocess upscaler: 8xNMKDSuperscale_150000G