When Becca looked behind her to see what Jen had drawn she found that she now sported a bulbous spider abdomen above her butt. It stuck out about two feet from her back and was covered in black chitin with a red hourglass mark on the top of it, like a black widow.
“Man, this is totally my style.” The goth remarked, turning to face Jen while Julie attempts to recover from being face fucked.
“If you want I could give you more spider parts.” Jen offered, twirling the marker between her six fingers.
“Sure triclops, but only if I get to do more changes to you afterwards.”
As soon as she had Becca's consent she began putting the marker to work. She drew a line around one of her arms, just above her elbow, before roughly covering her arm below the line. As soon as she finished the area she filled in became covered in the same black chitin that covered Becca's abdomen-tail. Jen quickly repeated what she did to Becca's other arm, and then did something similar to both her legs, turning them into chitinous, pointed, spider-legs. Becca wobbled on her new legs, getting used to the fact that she no longer had any feet as Jen continued her work. She drew another pair of arms on her, the two new limbs appearing when she finished. Moving to the goth's face she drew three pairs of small spider eyes on her forehead and a pair of fangs (though she didn't give Becca venom glands). Her final change was drawing another pair of breasts below her first pair, leaving her with four DD breasts.
“Wow, this is awesome! Though it is a little weird to walk on these little twig legs.” Becca lamented, leaning against a wall for support.
“Well, maybe I can make it easier for you” Jen replied.
She crouched down next to the goth's legs and began drawing. Once she stepped back Becca's legs now split into two points, one going straight down and one that angles forward to give her an approximation of heeled shoes.
Becca took a moment to walk around on her new legs, still finding it a bit awkward, but miles easier than the previous ones. Once she had mostly gotten the hang of it, she began experimenting with her other new body parts. She moves her new pair of arms around, using them to grope her new breasts, her cock hardening from the stimulation. She them reached back to her spider abdomen, concentrating a bit to release some webbing from her spinneret. Bringing the sticky silk in front of her, she began messing around with it, managing to weave a simple pattern between her hands.
Once she had finished exploring her new body, she took the marker from Jen with one of her upper hands, beginning to stroke her cock with one of her lower hands. With thoughts of what she is going to do fuelling her lust, the spider-girl turns the marker on Jen.