Halfway to school, Sarah suddenly grabs Linda's arm, pulling him into an alley between houses.
"Sarah! What the heck's gotten into you, nya!?" Linda exclaimed, surprised and a bit upset at his formerly female human best friend for his sudden action.
Sarah looked at the catboi, his eyes dilated and shinier than before, glittering with lust and need, face flushed and practically glowing with heat, and his breathing becoming deeper, causing his bunny ears to sway with every heave through his pink nose.
"I can't take it anymore, boing! I need you so badly Linda!" Sarah exclaims says, leaning in to kiss his bestie.
Linda could only look in shock, his eyes widening as he felt the bunnyboi's tongue invade his mouth, wrestling his own. He felt mortified as he felt their saliva mix together in his mouth, unable to fight back against the lust overtaking the both of them.
After a while of tonguing his friend, Sarah pulled out, only to slip down to Linda's skirt and pulling down his panties, freeing his now erect cock into the air, flicking a bit of pre into the bunnyboi's face.
"Sarah, please... we're boys... we shouldn't do this..." Linda begged his friend, unable to handle the immoral changes they've gone through. But Linda had a sad feeling that his pleads would not reach those bunny ears of his.
"W-what are you talking about? We're bois, and it's okay for bois to do this!" he says, shaking from the need for sexual satisfaction. Unable to wait any longer, Sarah wraps his mouth around Linda's boyish cock, causing the two of them to moan in pleasure, Linda's mind protesting with futility.
As Sarah's head bobbed up and down, and as closed his eyes Linda and moaned in pleasure, the alley began to take its own changes. The intricate details of everything in the area, down to the microscopic level, began to flatten out and fill every imperfect indentations until the alley, from the cracked cement to the rusty trashcans, turned into a scene straight out from an Japanese cartoon. Even the bits of grass growing lost their gradient of colors and became a flat, yet vibrant green.
Eventually, Sarah lifted his head from Linda's now saliva lubed cock, a string of spittle still connected to the bunnyboi's lustfully smiling lips. Linda, both relieved that he finally stopped and curious as to why, he opened his eyes to see a horrifying and exciting sight: Sarah had gotten on his hands and bunny feet, lifting his bubble butt in the air to present his ass to the catboi.
"Please Linda, boing! I want... no, I NEED you inside of me, boing!" he moaned aloud.
It was then Linda's mind went to war on his body and itself. Of course, his formerly female mind was protesting all he could to not give into this unnatural lust while keeping his body at bay and stationary. Unfortunately, it began to move on its own as another voice in her tone moved in.
'But your best friend needs help! You don't want to decline a friend in need, would you?'
While his mind was still strong and unwilling to leave, his hold on his body began to weaken as the other voice began to take the wheel in this conundrum. Step by step, Linda's body made its way to Sarah and sensually pulled down his panties from his butt and twitching tail, before plunging in between the bunnyboi's ass cheeks.
Linda's mind could only sob silently as he let himself go and began thrusting in and out into Sarah's supple ass. His stronger bunny feet allowed him to push his ass onto Linda's cock in rhythm, causing even more pleasure for the two of them as they both began to chant their verbal tics in beat with Sarah's, "Boing, boing, boing!" and Linda's, "Nya, nya, nya!"
All the while, the neighbors in the houses to the sides of the alley began doing their daily morning masturbations on their porches. The horseboi and alienboi in their respective houses were pumping at their cocks, the horseboi doing so while humping on a pommel horse while the grey alienboi was using his telekinetic powers through his antennae to stuff a dildo in his plump ass. Both had initially been human women doing their regular yoga exercises before the sounds of a bunnyboi pleasuring a catboi coming from the dividing alley reached their ears.
Their moans and verbal tics grew louder as they came closer to their climax with Linda letting out a loud and final, "NYA~!" as he shot large strings of sticky cum into his best friends ass. Feeling the cum lining his ass, Sarah let out a loud, "BOING~!" as he came as well, sticky strings spraying out all over the ground.
Never experiencing a climax, Linda could only collapse onto Sarah's back, panting in sexual exhaustion and his eyes welling up with large girly balls of tears at the demeaning realization that he had just had sex with his best friend and that it felt normal for two bois to do so.
Sarah, on the other hand, was in completely bliss, his face filled with flushing red happiness as he heavily breathed from being spent, some drool dripping from the side of his lip.
"Linda just filled me with his goo, boing! Sarah is so happy now~" he said, completely oblivious to Linda's despairing demeanor.
Knowing that nothing could change what was already done, Linda tried to fight his tears, wiping them away before Sarah could see him like this. He pulled his cock out of the bunnyboi's hole, the excess cum dribbling out and down his legs. Sarah then got up, his feet a bit wobbly after the sex before wiping the leaking cum off his legs and into his mouth.
"Mmm~! Linda kitty batter tastes so good, boing!" he said happily, Linda scarred once again at the sight he just witnessed and is trying to forget.
Looking at his phone, he expected that they were already halfway into their first class when he realized that time had barely moved at all! It seems the cascade had an interesting sense of time when it came to sexual shenanigans, leaving Linda and Sarah some time left before school even started.
"C'mon, boing! If we can hurry, then we can make it to class on time, boing!" Sarah said cheerily, slipping his panties back onto his sticky ass and bounding off on his bunny feet, with Linda hastily following after him.