It seems cannot generate imagine about Nidoking cunnilingus Meowstic stably since Nidoking is too tall or other unknown reasons. Here's my prompt and negative prompt:

masterpiece, best quality, score_10, score_9_up, detail, cute, indoor, a couple, two characters, 1boy1girl, hetero, cunnilingus when meowstic standing, cunnilingus, pussy, cunnilingus pussy, blush, pussy juice, lift up, furry, pokemon creature, feral, tail, animal ears, exclusive characteristics, feral, perfect nidoking, perfect meowstic, no human, furry only, nidoking cunnilingus meowstic

(nidoking: male, black eyes, cunnilingus the pussy, kneeling)

(meowstic: girl, standing, cute, pussy, colored sclera, yellow sclera, weak eyes, red eyes, white face, cat, open mouth, enjoyable)

Negative pro:

low resolution, blurry, low quality, bad body anatomy, letterbox, deformity, dismemberment, deformity, amputee, watermark, signature, monochrome, breast, (((anthro))), extra limb, wrong limb, pokemorph, homosexual, excess organs, optical illusion, obvious hairstyle, 3D, realistic, fusion, mature adult women, mature adult man, wrong organs, organs in the wrong place,mosaic, ugly face, mutated hands, mutated legs, mutated feet, low res, Reality, solo, Fusion, more than two roles, same characteristics with two characters, (meowstic: boy, Licking the vagina, black eyes, cunnilingus the pussy), (nidoking: girl, pussy, colored sclera, yellow sclera, wear eyes, red eyes, whith face, cat, being cunnilingus)