The doctor was walking in her lab when then she heard something strange at the distance, it sounded loud so she realised she was not alone, after opening a door she saw a lamia usurping her provisions, Fiona slowly approached her but the lamia quickly noticed, staring at her with her bright yellow eyes and vertical pupils.
"You sssssshould get out of here if you don't want any problemsssssss" the lamia calmly threatened her.
"The same goes for you, get out of here if you..." Fionna lowered her tone, "want to be eaten".
The lamia giggled, "Don't make me laugh, it ssssseems that we have sssssome trouble here" the monster girl quickly brought her red scaled tail closer to the scientist, for her surprise the woman put the tip of her tail in her mouth.
"W-what are you..." The lamia sweated feeling how her body was being pulled towards the woman, every second swallowing a big part of her tail.
"STOP, STOP" the snake girl screamed feeling her tail being digested by a weird human, eventually she started to swallow her crotch, licking a little her snake pussy, at this moment Fiona wanted to laugh and say something to her if her body wasn't full of her big body.
Seconds passed and Fiona swallowed the lamia's breasts, quickly she reached the head which instantly swallowed from a big gulp, the lamia didn't have time to scream as her body almost instantly vanished inside the scientist's stomach, merging her DNA with her.
Fiona erupted after the big meal she just had and saw how her belly quickly turned from big to normal after instantly digesting, now she tested her new form. Her legs merged and turned into a single one long limb, then red scales covered all of her new part from the tip of her tail to her waist, turning into a real lamia tail, her tongue got longer and sharp like a snake one and her eyes turned yellow with vertical pupils like the creature she ate, not satisfied Fiona played a little with her abilities, turning her hair into vines again, and her skin from waist to head into green, mixing both of the DNA she absorbed.
"I think I will stay like this for a while" she said to herself having fun with her powers.