Mary looked through the vials and found some design for couples. She decided to call down her husband Gabriel. Mary showed the box and vials to her husband. He was unsure about it. Mary said they could test it out by drinking the vials and if nothing happens then nothing happens. Gabriel was worried that it might be poison or something nasty, but Mary was undeterred saying that who would prank or kill them. Gabriel caved into his wife's argument.
Mary choose the sex demon couple vial and added a vial design to help couples better understand each other and grow closer together to it. Mary gave her husband the wife vial while she took the husband vial. Mary and Gabriel drank the vials at the same time and went back to their bedroom.
Mary and Gabriel felt horny and quickly undressed waiting for their change. Mary moved their full length body mirror, so they could see their own bodies while they sat and waited on the bed.
Mary body changed; she became more muscular, her face, body, arms, and legs becoming masculine. Her hair shortened, now only reaching down to the back of her neck. She grew taller going from 5'6" to 5'11". Mary's breast shrank into muscular pecks, her cunt closed up, her clit lengthen into a dick and her ovaries came out turning into her balls. Her cock grew stronger and had ripping on it, it grew intill it was 8 inches long. Her skin changed to purple as a thin tail grew out above her ass, demonic horns came out of her head, and black bat wings grew out of her muscular back. Her hair changed from brown to black. Mary now Mark checked out his self, flexing and groping her now flat muscular ass.
Gabriel body changed at the same time; his body shrank from 5'11" to 5'6". His face, body, arms, and legs became very feminine. All body hair under his eyebrows disappeared. His nails grew into feminine claws. His waist caved in and his hips and ass expanded. his black hair exploded in a cascade that fell down to his ass. His chest changed from pecs to E-cup breasts and his cock and balls shrank into a fleshly open slit. His balls entering him becoming his new ovaries and his cock becoming his sensitive clit. His tongue lengthen becoming perfect for giving great oral. And his skin changed to red as he grew a pair of horns, bat like wings came out his back, and a tail with a spaded tip grew out above his ass. Gabriel now Gabrielle looked at her super model like demonic body while fondling her breasts.
Mark looked at his newly minted wife, feeling his dick harden at her sexiness. Gabrielle felt her sex wettened at her husbands masculinity. Mary felt a closeness to Gabrielle like never before, feeling like this is the genders they are meant to be Gabrielle the sexy wife who loves to fuck and himself the caring strong husband who takes care of his wife's needs. Gabrielle looked into Marks eye telling him all that he needed to know, that she loves him so much more and they should take advantage of now being the opposite genders of what they once were.
Gabrielle lifted herself and moved to be sitting in Marks lap, facing him. Marks grabbed his wife's sexy ass while she leaned in to give him a deep kiss. Mark felt Gabrielle press her boobs against his strong chest as she began to make out with him. Mark helped guide Gabrielle onto his cock, as Gabrielle lowered herself. Gabrielle took all 8 inches of her husband's demonic cock in her. Mark felt as Gabrielle succubus pussy got to work milking him dry of is hellish cum. Mark felt his cock get caressed by cilia as he began to thrust into Gabrielle. Gabrielle continued to kiss her husband, while wrapping her legs around his hips.
Mark moved to put Gabrielle into the mating position. Mark always wanted to have a child, but they haven't been able to conceive on yet. Mark now planned to breed Gabrielle, painting her womb with his demonic hot cum. Gabrielle sensing what her husband wanted, offered no resistance to the move. Mark lifted Gabrielle sexy legs up and stopping the kiss. He started to thrust causing Gabrielle's tits to jiggle and her to moan. Gabrielle and Mark began to pick up the pace, with Mark thrusting harder and harder, and Gabrielle's pussy squeezing down on Mark's ripped cock. Gabrielle moaned as she felt Mark's cock hit all the right places and reach into her womb.
They fucked hard like that for and hour and a half, orgasming 17 times before having one last mind numbing orgasm that finally tired their demonic bodies out. Gabrielle stomach remained toned and flat despite all the cum in her. Gabrielle felt so happy having her womb filled with her husband's hot cum. Mark collapsed on Gabrielle and Gabrielle embraced him, allowing her husband to rest himself on her.
They stayed like that for awhile before Mark got up and pulled out. Mark looked at Gabrielle with a devilish glint in his eyes, as he thought of what they should do next.
Please continue this.