I built a model on tentacle mutation
can try on https://civitai.com/models/1490791/tentacle-mutation

you will need hidden prompt of mutated body,deformed belly,deformed breast

full prompt :
amazing quality, masterpiece,ave gen2, oily skin, wet cloth,tight cloths,detailed eyes, eyebrows, thick eyelashes,masterpiece, best quality, very aesthetic,suisei hoshimachi, blue eyes, blue hair, choker, hair between eyes, medium hair, side ponytail, star choker, classroom, sunset lighting, ,tentacle nipple burst, tentacle vein,tentacle impale, mind break, restrain on chair, sitting on chair, leg spread, infected, purple tentacle vein, purple bruise mark , school uniform, white shirt, worm, deformed breast, tentacle moust burst,eye penetration, big breast, mutated body,deformed belly,deformed breast, ear fuck , mind break, corruption, worm, egg in belly, tentacle pop out one eye, massive tentacle come out from mouth