Be a naughty girl, take her from behind in the sandbox (Futa mode)

"You've been around the block a few times, right, Heat Girl? Even a pure-hearted teacher like you has probably fingered that pussy a time or two with those big fingers of yours," Buster Girl teased, squatting in the sandbox next to Heat Girl with a devious smile on her face.

Heat Girl wore an embarrassed expression as she crossed both hands protectively over her waiting vagina and the thick patch of black pubic hair above it. "W-Well... Yes, I've done that before! Even I have needs," she admitted, puffing her cheeks up in an unamused, pouting face.

"He he... There's always more to learn, though! I think I can teach an old dog some new tricks." Saying this, Buster Girl reached both hands out, then scooped up Heat Girl to flop her down on her belly, face in the sand. When the other girl sputtered, indicating that she didn't like that new trick very much, Buster Girl seized the initiative (among other things) by smacking both hands down upon Heat Girl's broad, meaty hips. Without delicacy, she yanked the girl's buttocks up and into the air, marveling at the size of the sweat-slick, globe-like ass in front of her. "Ever since I heard your voice lecturing me, when you made me jump across that silly block puzzle, I knew there was one thing I wanted!"

"A-A jet tool, that could take you straight over the blocks?" Heat Girl questioned, smiling over her shoulder at Buster Girl, as though putting on a cute expression would make it hard for Buster Girl to act on this overt threat of hers.

"Not quite! I'm a hero, but even I have a vengeful side~" With that ominous warning imparted, Buster Girl left no time to act on it; instead, she raised one over-sized hand, then delivered a meaty smack to the other girl's ass. The jiggling was unreal, as ripples spread from the point of impact like she'd just whacked a bowl of gelatin; Heat Girl cried in indignation at the touch, as the red shape of Buster Girl's hand began to form upon her steaming hot body. "I only wanted to do it more after I saw these big, fat buns of yours!"

"Wait, Buster Girl! B-Be nice! I'm already tired from our fight! Oooo-ooh!" Buster Girl's opponent wailed in a pitiable voice, then lay her cheek back against the sand with clenched teeth as more smacks rained down against her bottom.

"Hey, I'm not the one who almost dropped somebody into a BBQ pit! I've been plenty patient and it's high time I was rewarded for it!" Buster Girl fired back, grinning challengingly as she hugged one arm around the girl's waist to keep her steady, digging her fingers into the softness of Heat Girl's belly, then rained more smacks upon the other girl's shaking ass. Soon, Heat Girl's butt was looking as red as the panties she'd been wearing earlier, glowing from the **** of the strikes. Moreover, her pussy was twitching with unintentional arousal, dripping liquid down her thighs and droplets into the sand. "Mommy likes to be spanked, huh? I was hoping I wouldn't be the only one enjoying it!" Relentlessly, Buster Girl opened her mouth into an open-mouthed grin and extended her tongue, then plunged her face into the expanse of that waiting ass.

"Th-That place is dirty! Don't put your face there!" Heat Girl begged, while Buster Girl motor-boated her massive ass-cheeks. Her body was helpless against the attack; there was no raising herself after the intense battle she'd just lost.

"Wow, that's a porn line if I've ever heard one," Buster Girl teased, then grabbed a hand onto each cheek to spread them. She began to run her thirsty tongue up and down the girl's undercarriage, teasing the parts that had been hidden before and lapping up the sweet pussy juice as it continued to leak out. "Mmmm... You've got a body built for sexual education!" Despite the praise, she released one ass-cheek and let it jiggle, then began to slap her hand up and down upon Heat Girl's raw and tender booty.

"Heeek! W-Where did you learn to do all of this?!" The robotic day-care teacher buried her ashamed face into the sand, unwilling to show her partner her look of arousal.

"Blame my programmer!" Buster Girl shot back, then withdrew her face to admire her handiwork. Heat Girl's ass was glowing red and her legs were twitching; she was leaking like a broken school water fountain now, with steam rising from her vaginal crevice. "He he he... That Atomic Fire isn't all the way gone after all, huh?" She questioned, sticking two big fingers into Heat Girl's hole and wiggling them around. Sure enough, the heat coming inside was immense; nearly dangerous! "Is that a self-defense thing?"

"No... You can blame my programmer, I guess," Heat Girl replied weakly. Despite her earlier protests, she was wiggling her hips expectantly now.

Buster Girl responded to the call to action, pulling her girl buster free from her leotard to stand erect between her legs and then nestling it gently into the groove between the other girl's ass-cheeks. "Those buns of yours and this dick make a nice hot-dog~"

The other girl was too embarrassed to respond as she felt her tormentor's Girl Buster rubbing up and down between the walls of her buttocks. Her vagina was burning with desire, waiting for the moment of insertion.

"If one hole's too hot to handle, I'll just have to use the other!"

Heat Girl brought her sand-covered face up for a moment to look behind herself, her green eyes widening with surprise. "W-Wait-!" She managed to spit out, before her eyes suddenly widened and crossed. Her tongue hung out slightly as a moan escaped her throat. "Oooo! Buster Giiirl! That's the wrong hole!"

The other girl laughed in victory as she wiggled the Girl Buster in, moving it further through the opening of Heat Girl's asshole. A normal girl might not be able to take it, but Dolly had made her Robot Mistresses pliable enough to handle such a thing. The huge girth of the toy disappeared further and further into its target's body, as Buster Girl pushed it in nearly to the batteries, far enough so that her own hips hit against the woman's ass. "I'm the one who gets to decide whether it's right or not, Heat Girl! Besides, I licked it a little earlier, so its nice and wet," the blue-suited heroine snickered.

"You naughty girl!" Heat Girl sobbed, hiding her face in the dirt again.

Laughing, Buster Girl parted her legs into an inverted V stance behind her face-down, bottom up opponent, placed both hands upon the swell of those hips, then began to dig the weapon in and out of her opponent's oversized ass. Adding injury to insult, she began to smack the cheek that she'd neglected a bit earlier; satisfying, meaty slaps rang out over the abandoned school playground. "Don't worry. After this, you get to have a nice, big nap while Doctor Light performs the bug fix. So, with that said, I'm going to really enjoy this time while you're still awake! It's fun playing in the sandbox, right?!"

"Oooh! Oh oh-aaaah!" the disgraced enemy wailed, clenching both hands onto the wooden brim of the sandbox as her hips bucked back and forth with the **** of Buster Girl's pelvic thrusts. "Can I really go back to being a teacher after this?!"

"Sure! Everyone loves a teacher like this!" Buster Girl encouraged her. A humming noise coming from the Girl Buster told her that time was just about up. "See? Even at your age, there's still firsts! You're about to get your first anal plasma creampie! How's it feel?"

The other girl's black hair, free from its bun, jostled back and forth, then matted against her shoulders as she raised her head and moaned, feeling the release of Buster Girl's weapon inside the cavern of her anus. The control chip inside of her was obliterated, just as Doctor Light had instructed Buster Girl to incapacitate the Robot Mistresses, and her eyes began to close slowly. "I think... I might... be into it," Heat Girl answered slowly with the last of her energy, wearing a masochistic smile as she collapsed with her legs splayed lewdly; steam and smoke rose out of her asshole from between her reddened cheeks. "You're so... naughty..." Finally, her eyes closed and her power ran out.

"Yeah, so I'm told," Buster Girl answered her incapacitated opponent with a giggle, tucking back up her Girl Buster and then smacking the gritty sandbox dirt off both hands. "Now... how do I drag her out of here?" She suddenly wished that Doctor Light's instructions had been a little more thorough. "I'll get him to call a little robot over here to pick Heat Girl up! I know Dolly took all his robots, but there's probably something for it!" With that, Buster Girl crossed both arms behind her head and left with a smile on her face, leaving the defeated Heat Girl face down with her big butt facing towards the moon in the night sky.