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Heroes of Hopes and Dreams

Not that they needed to speak fish to understand undyne. quite frankly, that little quip even got quite a laugh out of her. undyne took a moment to evaluate the opposition.

Action, Comic Book, Epic, Fighting, Human, MLP, Mettaton, Music, Ocellus, Papyrus, Robot, Sans, Smolder, Undertale, Undyne

Draconicon's R34 Harem 17: Scientific Help

She flicked her eyes to the left, catching sight of undyne in the waters near waterfall.

Alphys, Asriel, Closet pervert, Corruption, Dildo, Draconicon, Dragon, Exhibitionism, F/solo, Goat, Harem, Horny, M/F, M/M, Masturbation, Musk, Reptile, Series, Shy, Voyeurism, Wet

Milking for Muffet

Summary: aimi is captured by undyne and muffet, and the two ladies put him through the wringer.

Bondage, Cock Milking, Condom, Cum, Domination, Girls With Cocks, Male/intersex, Muffet, Oral, Orgasm, Piranha, Spider girl, Undertale, Undyne, Webs, embarrassment

The Piranha's Denial

Frisk and undyne have become a couple after frisk becomes an adult, and frisk decides to offer undyne a challenge. stay in chastity for two months. she takes it on, but can she finish it?

Chastity, Cum, Desperation, F/solo, Frisk, Horny, Human, M/F, Orgasm, Pheromones, Squirt, Sweat, Time Skip, Undertale, Undyne, Wet, denial, dripping, need, nipple play

Alphys' Modern Life: Camera Shy (Part 1)

Papyrus asked undyne, returning all of the stage props to their rightful, proper places while undyne put her mouth directly over alphys' and blew her full of air again, effectively reinflating her back into her normal state.

Abuse, Adorable, Adorkable, Adult Content, Alphys, Anal, Anime, Anthro, Asgore, Asriel, Bestiality, Bisexual, Blood, Blush, Bondage, Breastfeeding, Breasts, Burgerpants, Canine, Caprine, Cartoon, Cartoony, Cat, City, Comedy, Creampie, Crossover, Cum, Cumshot, Cunnilingus, Cute, Dancing, Dog, Ears, Ejaculation, Eldritch Abominations, Endosomatophilia, Erection, Erotic, F/F, Fanfiction, Fantasy, Feet, Femdom, Fetishes, Fighting, Fish, Flowey, Foot Fetish, French Kissing, Giant, Glasses, Goat, Godzilla, Horns, Humiliation, Humor, Incest, Insanity, Kissing, Lesbian, Licking, Lizard, Love, M/F, Macro, Masturbation, Memes, Menstruation, Messy, Mettaton, Mind Control, Monster, Musical, Naked, Naughty, Nickelodeon, Nudity, Odors, Oral, Orgasm, Papyrus, Parody, Pheromones, Police, Porn Flick, Pornography, Posing, Prison, Public, Pussy, Rabbit, Relationships, Reptile, Robophilia, Robot, Rocko's Modern Life, Roller Coasters, Romance, Rule 34, Sans, Satire, Scalie, Semi Consensual, Sex, Sexy, Shrinking, Singing, Size Difference, Skeleton, Song Parody, Suicide, Tail, Tailhole, Teasing, Tits, Toriel, Undertale, Undyne, Vaginal, Video Games, Voyeurism, WORSHIP, brains, cameras, dating, dinner, drooling, embarrassment, giantess, gross, moaning, privacy, shipping, skiing, spaghetti, toes

Alphys Fornicates With The Amalgamates (Director's Cut)

undyne told papyrus as the two of them scooped up her thoroughly defiled body and hauled her over to undyne's house in waterfall.

Anal, Anthropomorphic, Balls, Blowjob, Blush, Breastfeeding, Catgirl, Dark, Dog, Domination/Submission, Ejaculation, Fanfiction, Female, Female Ejaculation, Foot Fetish, Gay, Glasses, Handjob, Hermaphrodite, Horror, Humiliation, Humor, Insanity, Kinky, Lactation, Lesbian, Lizard, Lust, Masturbation, NSFW, Parody, Penetration, Pheromones, Rape, Romance, Rule 34, S&M, Satire, Scalie, Striptease, Vaginal, Various Species, Vore (hard), Vore (soft)

Alphys Höek

"i want to rub my cock inbetween undyne's webbed toes and suck on them."

Abuse, Adorable, Anthropomorphic, Bestiality, Cat, Chubby, Comedy, Cute, Dog, Domination/Submission, Fanfiction, Feet, Fish, Foot Fetish, Glasses, Hug, Insanity, Lesbian, Licking, Lizard, Massage, Meme, Music, Penis, Pet, Prostitution, Romance, Satire, Slavery, Space, Teasing, Tickling, Vagina, Video Games, Vore (soft)

Ultimate Furry Crossover: An Adult Choose Your Own Adventure Entry 31

“hi, undyne,” the skeleton said finally. “i brought you some guests. they’re friends of mine – and toriel’s – so be nice to them, okay?”

Bondage, Choose Your Own Adventure, Crossover, Equine, Fingering, Horse, Human, M/F, Monster, Oral, Rule 34, Scalie, Spider, Superheroes, Undertale, Vaginal, Vampire, Violence (Not In Yiff)

Commission: Sleeper Royale

"on your end either, though undyne seems to be making her way well enough." she turned to look at the monitors, where coco was spraying undyne in the face with the shower head.

Alien, Bandicoot, Chloroform, Cynder, Dragon, Dragoness, Groping, Guardians of gahoole, Gylfie, Lesbian, Otulissa, Owl, Questionable consent, Rouge The Bat, Sonic, Tail Sex, Undertale, Undyne, coco, self discovery

Tempted By The Feet Of Alphys

Alphys commanded undyne, grabbing a yuri magazine off of the table and beginning to smugly flip through it as undyne dug right in. "awoooooo!"

Anthropomorphic, Cuddling, Domination/Submission, Dominatrix, Ejaculation, Erotic, Fanfiction, Fish, Foot Fetish, Foot Jobs, Foot Worship, Glasses, Kinky, Lesbian, Licking, Lizard, Love, Masturbation, Mature, NSFW, Orgasm, Relationships, Rule 34, Sweat, Teasing, Video Games

The Piranha's Muscle Slave

Frisk and undyne go to a gym, and undyne unintentionally causes shenanigans.

Facesitting, Gym, Human, Humiliation, M/F, Master/Slave, Piranha, Sweat, Undertale, Undyne, embarrassment

Undyne & Papyrus: Alphys' Inside Story

"watch and learn, undyne!

Adorable, Alcohol, Anatomically Correct, Anatomy, Androgynous, Anthro, Blood, Bondage, Butt, Cartoony, Comedy, Cute, Dancing, Ears, F/F, Fanfiction, Fish, Humor, Liver, Lizard, M/F, Mind Control, Naughty, Parody, Romance, Satire, Scat, Shrinking, Singing, Tongue, Torture, Undertale, Vore (soft), brain, giantess, gross, hearts, lungs, mouth, platonic, puns, shipping, slapstick, stomach, throat, weird