Mood shift

Jayden takes turns fucking Tisha and Mara. When he is fucking his sister Mara is either whispering in his ear and urging him to plow his sister harder, or making out with her. When Jayden fucks Mara, she has Tisha ride her face and make out with her brother. When Jayden seems tired, the girls make out with him before deciding to give him a lesbian show. Sixtynining on the floor with Mara on top of the ebony beauty. All three have been on the verge of cumming but somehow unable to climax. Probably the nerves, Mara thinks.

Jayden joins the girls again after a breather, "Which one of you wants to help me finish and take my load?" "Ooh, blow your load in this white pussy and your sister will suck and clean everything that drips out of it!" "What? You don't want your brother's cum inside you?" Mara teases. "Hell, I'll have plenty of chances to get it later, won't I bro?" Jayden nods, grinning. "...But you helped us get together like this, the least I can do is let you have the first serving!" Jayden enters Mara slowly and grabs onto her hips for a serious hard fuck. This time something feels different. This time Mara can feel the orgasm approaching. "FFFfuuuuck! I'm so close... Give! It! To! Meeeee!" Mara closes her eyes in anticipation, Tisha's tongue work and the cock pounding in and out of her finally helping her climax. ...and when she opens her eyes, they glow with the fires of hell.

Jayden's cock erupts inside her pussy and she milks him harder than any pussy he has experienced before. Harder than any mortal pussy can. Bright red colour spreads from Mara's veins and into her skin, glowing for a moment before settling to a crimson succubus skin tone. She arcs her back and screams out her orgasms, canine teeth extending into fangs and her tongue turning black and forked. Tisha screams in panic as well and tries to escape from beneath the changing woman, but Jayden is paralyzed by his pleasure and can't stop himself from cumming his life and soul into the newborn succubus. Mara shakes her head in pleasure, her now pitch black hair spreading out and revealing horns growing out of her skull. As the hair settles down to cover her now massive perky crimson breasts with black nipples she cups them in clawed hands, admiring her new body. Tisha manages to slip out from underneath her when Mara's wings burst out and the mix of pain and pleasure nearly causes the succubus to fall ****, just in time to scream as Tisha sees her brother's drained and dried out corpse fall on his back.

"You're not going anywhere." Mara purrs at the panicking young woman and leaps at her, catching her before she can get out and pressing her against a wall. She can feel her new tail growing out and the feeling makes her nearly collapse. Tisha struggles and cries but Mara silences her with a forceful kiss. Toying with here victim Mara tries out her tail and first caresses Tisha's legs with it, before plunging it into her cunt and **** her against the wall. "Hmmm... I do believe there was a promise you made." She says when she finally breaks the kiss. Tisha is too stunned to answer. "I seem to recall you promising to suck out your brother's cum from my pussy..." "Y... You can't be serious!" Tisha manages to stammer. Mara gives her a grin before pushing the tainted and frightened teenager onto her knees. "Eat up! Hell, if you do a good job, I migh spare you and let you become a succubus like me!"