You pump in and out of your brother's tight pussy, the two of you frantically kissing and licking each others bodies. Behind you, the androgynous red man that was once your mom is assimilating your girlfriend, as she grunts and moans to the sensation of her pussy being filled with Mother's large jelly cock. Changes begin to appear on her body as her human cells are converted into the hive, her modest bust begins to expand along with her rear, causing Becky to bite her lips in pleasure, her vagina begins to feel tighter and two lumps are felt pushing against Mother's cock, pushing him out from your girlfriend.
"Holy shit!, Jack this feels so good!" She exclaims short of breath, her new testicles fully descended and swelling to the size of golf balls, Mother next gives her ass a large smack and he inserts his cock into Becky's rectum, causing her to moan in a noticeably deeper tone.
Becky's brain then becomes seized by the hive cells, taking full control of her body, not that she was resisting anyway. As her eyes turn black, a sinister grin dresses her face, moaning deeply at her clitoris stretching out to form a hefty 8-inch penis, cementing her transformation into a male. Mother continues fucking Becky in his asshole, as Becky's frame begins to expand and stretch out.
You and your former brother continue fucking, you take her large breasts in your hands and knead them like dough, she squirms in pleasure before you are finally taken over the edge and ejaculate deep into her alien uterus. You lay down next to her and make out with her for some time, cupping her huge ass, as you pull away you look at her body, noticing you ejaculate inside her translucent body, seemingly dissolving as your sperm cells are neutralized and incorporated by her hive cells.
"So you can't get pregnant?" You ask her. "Our cells are incompatible, while we can take on human form, there is no way for our two species to reproduce, beyond assimilation, of course." She replies, she wraps her arms around your neck and nuzzles her head against your neck.
*Cough* "Ahem." Mother says, drawing your attention to the two figures standing before you and Brother. Next to Mother, stands a tall purple figure, with luscious curves lain over a bulky and muscular frame, you look down and notice his large cock and balls, causing you to sport a semi. You rise to your feet.
"Becky? goddamn." You say, your girlfriend now towers over you, sporting larger arms and legs, and a much bigger member. "Mom, thank you." You pull Mother in and the two of you begin making out passionately, you run your hands over his hips and thighs, and begin jerking his cock as your tongues exchange saliva, Becky then grabs you from behind, easily lifting you in the air as he slowly lowers you onto his own penis, Mother grabs your legs to keep you stable and encloses his mouth over your dick, sucking you off like a pro. You gasp for a moment before feeling astounding pleasure as your anus is taken by your former girlfriend, bobbing up and down on his stiff jelly cock. Your brother then slides over to behind Becky, and grabs his juicy buttcheeks before sliding her tongue deep into his asshole.