You look at your sister Amber's page and see: Ears: White furred bunny ears. You wait hearing her scream turn into a sob as she runs out the washroom to cry to your father. Your father and sister aren't blood related to you. Your father married your mother after their respective spouses died. Only your younger brother is related to everyone.
You see your sister pass down the stairs in a rush as she rushes to your parents in the kitchen. As she passed by you you saw her new 12 inch white bunny ears adorning her head. You hear her sob to your parents as they also freak a bit at her appearance. You hear your father reassure her and suggest going to the hospital to get her checked out. You wait in the living room as you see them pass by and try to open the door only to find out they can't leave.
You see your father try and break the door down to then follow up by trying to open the windows, then trying to break the windows once he realized he couldn't open them. This causes your parents and sister to freak out.
Some time passes as your father and mother call everyone for a family meeting in the living room and explain the situation to you and your brother. You do your best to pretend to freak out at the news and your sisters appearance.
You pretend to calm down by reading a book. Of course you look at the book that is causing all this. You see on the last page that the book has decided to speed up your father and sister's changes by saying "For those you tried to leave before their changes finish a blessing. You shall now change faster for those who enjoy things slowly to take advantage of."
You nearly drop the book as your mother screamed seeing your father start to grow a pair of black horns. You, your mother, and your brother watch in horror, lust, and fascination as you see your father and sister rapidly change.
You father Gabriel horns grew till they curled to the back of his head, his hair turned into a crimson red and lengthen till it reached his ass, his masculine face became very feminine, his ass expanded, his waist caved in, while his hips expanded giving him and hourglass figure, his legs merged into one, they quickly grew red scales and lengthen. It was clear his lower half was now that of a serpent. These changes to his lower half caused his pants and underwear to rip, which exposed his crotch. Everyone saw his dick disappeared and become a nice pink pussy, said pussy was still human, his ass as well. His snake lower half was connected from just below his crotch, allowing some of his now juicy thighs to remain human. He then quickly became a she as 2 pair of breasts grew from her chest. The top pair expanded till they were G-cups while the bottom pair grew to F-cups, She then grew 2 more pair of arms, she now had 6 arms and 4 breasts.
You saw your father Gabriel quickly rip of her shirt with her hands and procced to masturbate. She looked like a beast in heat. You saw her nails lengthen into claws, her pupils turn into slits, her ears lengthen into elf like ears, her belly became toned, and her tongue came out showing how it was longer, prehensile and split at the tip. You father's lower half was long and you took a quick peek at the book at saw that her lower half is 22 feet long.
You then see your sister Amber quickly change as well. You witness her remove all of her clothes. You then see her change. Her ass and hips expanded, while her waist cave in, her body became toned, her breasts expanded from large C-cup to E-cups, a round fluffy rabbits tail popped out from her tail bone just above her ass, and her clit grew into a full functional 6 inch cock.
You look at your father and sister's pages in the book. Your father's page gave many details on the change, but in brief your father Gabriel has just tuned into a Succubus-Lamia, who is currently in need of a good fucking. On your sister Amber's page, in brief she has just turned into a horny futa/herm bunny-girl and what's more is that she is like a playboy bunny girl except with real ears and tail.
Your mom quickly gets away from your father and goes over to Kirk to cover his eyes and ears from the sight and noise of your sister and father. You then see your sister come over to your father and it looks like she is going to fuck her, but you see Gabriel's eyes light up with a predators glint and she pins Amber to the ground and they begin to fuck. You felt you dick harden and decided "why the fuck not, I have nothing to lose." You took of your pants and underwear, and took your father's juicy ass. You saw your mother freak out seeing you join the changed family members. You saw her then run with your little brother up the stairs and heard her lock a door.
Your fathers new ass felt good and you couldn't wait for your changes to take place. You took a quick peek at the book and saw that the only changes to Gabriel's and Amber's minds is just making them super horny at the moment, but the book was quickly writing down more mental changes into them. One thing you notice on your father page is that her asshole was now a pussy as well. You manage to reach and turn the page to your page and saw that your changes were now beginning.