Resources used: (bare in mind that I do quite a lot of editing on pictures so you might not get quite the same results)

Photoshop
Stable Diffusion (Forge Flux) 
Extension: Forge Couple
Model:  furrytoonmix_xlIllustrious

Prompt Infos: 

SonicxTails:

Steps: 35, Sampler: Euler a, Schedule type: Automatic, CFG scale: 7, Seed: 3467896864, Size: 1024x1024, Model hash: b3897ed289, Model: furrytoonmix_xlIllustrious, Denoising strength: 0.08, Clip skip: 2, Mask blur: 4, Inpaint area: Only masked, Masked area padding: 32, Lora hashes: "StS-Illustrious-Detail-Slider-v1.0: 2e7a68ec7e2e", Version: f2.0.1v1.10.1-previous-664-gd557aef9

<lora:StS-Illustrious-Detail-Slider-v1.0:3>, masterpiece, best quality, amazing quality, male, very aesthetic, high resolution, absurdres, sonic the hedgehog \(series\), bedroom, Sonic the Hedgehog, penis, balls, Missionary, anal penetration, anal sex,
<lora:StS-Illustrious-Detail-Slider-v1.0:3>, sonic the hedgehog \(series\), Tails the Fox, on back, tall, wide hips, being penetrated, moaning, side view,
<lora:StS-Illustrious-Detail-Slider-v1.0:3>, bedroom, bed, sonic the hedgehog \(series\), hands on butt,

Negative prompt: realism, 3D,busty, ugly face, mutated hands, low res, blurry face, black and white, text, human, watermark, chubby, pubic hair, eyelashes, tears, lips, shoes , socks, eyelashes, plate, plates, ((((Female)))), ((breasts)), eye lashes, on car, eyelashes, feminine, shirt, bra,

Sonadow:

Steps: 35, Sampler: Euler a, Schedule type: Automatic, CFG scale: 7, Seed: 1037215360, Size: 1024x1024, Model hash: b3897ed289, Model: furrytoonmix_xlIllustrious, Denoising strength: 0.3, Clip skip: 2, Mask blur: 4, Inpaint area: Only masked, Masked area padding: 32, Lora hashes: "StS-Illustrious-Detail-Slider-v1.0: 2e7a68ec7e2e", Version: f2.0.1v1.10.1-previous-664-gd557aef9

masterpiece, best quality, amazing quality, male, very aesthetic, high resolution, absurdres, newest, <lora:StS-Illustrious-Detail-Slider-v1.0:3>, living room,
sonic the hedgehog \(series\), Shadow the Hedgehog, view between legs, implied fellatio, deepthroat, oral, testicles, saliva, standing, giving blowjob, black neck,
BREAK
sonic the hedgehog \(series\), Sonic the Hedgehog, squatting, penis, balls, precum, receiving blowjob,

Negative prompt: realism, 3D,busty, ugly face, mutated hands, low res, blurry face, black and white, text, human, watermark, chubby, pubic hair, eyelashes, tears, piercing, lips, shoes , socks, eyelashes, plate, plates, ((((Female)))), ((breasts)), eye lashes, on car, eyelashes, feminine, shirt, bra, Standing, golden ring, collar,