“Fuckin’ finally.”
 
Undyne gave a sigh of relief as she entered the web-filled cave. With the elevators being down, she had to take the long way to the capitol. Sadly, that meant crossing Hotland. Even without her suit of armor she was sweating bullets, both her sports bra and yoga pants utterly drenched. Thankfully, this cave provided some shelter from the heat.
 
She pulled her bra up with one finger, allowing her fat, sweaty tits to plop out and cool off. Usually she refrained from public nudity (While on the clock, at least.), but it’s not like anyone was here to see her. Her breasts were impressive, each being a couple of feet wide in all directions. Nobody was quite sure how she was able to fit them into her armor, but she had her ways.
 
Undyne closed her eyes, letting the coolness of the cave put her at ease. Suddenly, she let out a shocked moan as her breasts were suddenly groped. Her nipples hardened, her sensitive tips starting to squirt milk all over the cave floor.
 
”GAH! What the fuck?!”
 
Undyne opened her eyes, only to be greeted with an upside down smirk. Muffet was dangling from a web above her, all six of her hands kneading and inspecting Undyne’s breasts.
 
”Ahuhu~ Nice of you to drop by~”
 
”Hands off!” Undyne snapped, slapping those hands away from her breasts. The movement caused her leaking tits to jiggle, which she quickly tried to contain under her clothes. A web shot down from above and landed on Undyne’s sports bra, yanking it up over her head and high into the sky. “Hey! Give that back, punk!”
 
”Awww, but you look so much better with it off!~” Muffet replied with a devilish grin. “Besides, it’s not my fault you walked into my house and took your top off! Not that I’m complaining~”
 
A blush appeared on Undyne’s face. She crossed her arms, covering her nipples with her elbows. “Yeah, well if I knew you were here… Ugh, I don’t have time for this! Gimme my bra and lemme through, I got shit to do!”
 
”Oh nonono, nobody comes through here without paying the toll~ That’ll be one-hundred G’s, please!~”
 
Undyne growled. She wanted to show Muffet her place, but she really had to get going. She reaches into her yoga pants, only to find that she doesn’t have her wallet on her.
 
“Well shit, I left it in my other pair of pants. Can I pay ya later or something?”
 
”Ahuhu, nope!~” Muffet smiled, starting to flick at her skirt. “That’s okay, you’ll just have to pay another way!” She replied, lifting her skirt up. Undyne felt a fat, five-foot slab of flaccid, puplre dickmeat slap the top of her tits, throbbing and covered in grimey nut. “See, I’ve been SUPER horny recently, and it’s so hard to get off by myself! If you could just help me get off, I’ll call us even~”
 
Undyne was at a loss for words, her eyes staring at that dick. It was heavy, but being the powerhouse she was it wasn’t any issue for her. A smirk cracked her lips as she looked back up at Muffet. “What? Just need to make this little thing nut? Hah! You got a deal!” She laughed as she ripped her yoga pants in two, showing off her fat, juicy ass and plump, panty-free pussy.
 
”Ahuhuhu… Good! Oh, and just one more thing…” Muffet smiled, taking her skirt completely off. The moment she did so, a mighty series of PLAPS! Echoed through the cavern as the weight on Undyne’s breasts. All SIX of Muffet’s cocks were on Undyne now, each one equally as big and as grimey as the first. Her balls hung above them, both bloated beyond belief and churning loudly.
 
”Wha-“ Undyne gasped, gawking at the sheer number of dicks. “Wait, you didn’t say you had six! That’s some bullshi-“
 
Before she could even finish, several webs shot out from the sides, binding Undyne’s wrists and ankles to keep her suspended in the air, making her lay backwards above the ground. Muffet giggled, turning herself around to stand on the floor, her members dragging down Undyne’s toned body, growing erect and poking at her ass.
 
“Should’ve read the fine print!~” Muffet giggled, grabbing Undyne by the legs, three hands in each.
 
”But I never signed any-“
 
With a mighty THRUST, both Undyne’s cunt and asshole were stuffed full of cock. They were split evenly, three penetrating her pussy while three went in her backdoor. She let out a shocked cry as her holes expanded with the dick already starting to stretch and gape wide with the bundle of cocks. Even without any lube, Muffet was able to force herself in balls-deep and happily thrust and plap away at the fish’s folds. The wet, sloppy noises echoed in the cave, ringing in Undyne’s ears as her body was violently bucked back and forward.
 
”FUCK! GAH! YOU’RE HUGE!”
 
”Ahuhu!~ Thank you!~” Muffet giggled, giving a ladylike wave of her hand as her underside mercilessly wailed away on Undyne’s backside. She was already starting to feel sore from the ruthless railing, every slam causing her insides to expand even more to take the dicks. Her prostate was pounded to a pump, and her womb had been invaded by the cockheads and well beyond. “Mfhh, oh! Oh!~ Here it comes!~” Muffet chirps in a singsong voice, her nuts churning louder. “I’m gonna cuuuuuuum!~”
 
”Already?!”
 
“AHUHU!~” Muffet cackled, giving one last thrust. All at once, her cocks shot thick ropes of nut inside Undyne. The fish let out a wailing moan as she began to bloat, both her anal cavity and womb becoming beyond packed to the brim with cum. Muffet had plenty to give, Undyne’s belly starting to slosh violently with bubbling, steaming hot cum.
 
”FUUCK! NAGHHHHHHH!” Undyne screamed, her face bright red as her perfect, flat belly became utterly ruined by the sheer amount of semen inside her. She could feel herself getting actively knocked up, her belly pushing back on her face to smear sweat into her face. After several minutes of nonstop cumming (And a mix of screaming, moaning, and laughing from Muffet), the cocks went from an outburst to a drizzle before finally stopping.
 
One-by-one, Muffet’s cocks were pulled out with a wet POP, slapping onto the floor and drooling with cum. Undyne’s holes were gaping wide, each spitting out cum as fast as possible. Her belly slowly began to shrink down, but it was clear she wouldn’t be able to walk-or even stand-for a while. The fish was reduced to idly babbling and groaning, her eyes rolled up in a mindbroken bliss as she weakly spasmed and leaked cum out of her ass, pussy, and even mouth. The webs gently lowered her to the floor, the other web dropping the sweaty sports bra onto her face. Muffet gave a giggle, giving each of her dicks a stroke with a hand.
 
”There, you’re free to go!~ Ahuhu… Unless… you wanna give me a little tip?~”