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Alphys VS Undyne

The three of them screamed their brains out as they suddenly saw gaster chasing after them, prompting them to immediately take off running as fast as they could! "alphyyys' moddderrrn lifffe!"

Abuse, Adorable, Anal, Anime, Anthro, Bikini, Bisexual, Breastfeeding, Breastplay, Comedy, Cum, Cumshot, Cute, Dancing, Domination/Submission, Ear Fetish, Ejaculation, Erection, Family, Fanfiction, Female, Femdom, Fighting, Fish, Foot Fetish, French Kissing, Friendship, Gang-Rape, Gay Relationships, Genital Vore, Glasses, Handjob, Humiliation, Incest, Insanity, Kinky, Kissing, Lesbian, Licking, Lizard, Love, Masturbation, Mermaid, Mind Control, Nudity, Orgasm, Parody, Public, Rape, Reptile, Romance, Satire, Scalie, Sex, Singing, Soulmates, Strangulation, Striptease, Tail, Teasing, Tentacles, Tickling, Underwear, Vaginal, Video Games, Vore (soft), Voyeurism, Wrestling

An Experiment Gone Wrong? CH.7 (Rewrite)

I'm sure gaster never gets tired of having a chance run more test on me." you give a light chuckle, "my child this isn't something to be taken lightly. i very concerned about your health and your lack of sleep as of late."

Asgore, Asriel Dreemurr, Frisk, Gaster, Hurt/Comfort, Named OC, Papyrus, Sans, Toriel, Undertale, Undertale AU, Undyne, chara

An Experiment Gone Wrong? CH.9 (Rewrite)

Asriel didn't know what to do, he hasn't seen you like this for a while, not since you first agreed to see gaster. asriel reach out to give you a hug, but you stand up from the bed before he can wrap his arms around you.

Asgore, Asriel Dreemurr, Frisk, Gaster, Hurt/Comfort, Named OC, Papyrus, Sans, Toriel, Undertale, Undertale AU, Undyne, chara

An Experiment Gone Wrong? CH.6 (Rewrite)

I should-" she cuts you off, "even so i think we should swing by and see gaster to make sure. i don't want to take the risk of you getting worse if it's something that can be prevented."

Asgore, Asriel Dreemurr, Frisk, Gaster, Hurt/Comfort, Named OC, Papyrus, Sans, Toriel, Undertale, Undertale AU, Undyne, chara

An Experiment Gone Wrong? CH.5 (Rewrite)

You have a feeling they wouldn't work in the underground, but gaster and sans could probably work something out.

Asgore, Asriel Dreemurr, Frisk, Gaster, Hurt/Comfort, Named OC, Papyrus, Sans, Toriel, Undertale, Undertale AU, Undyne, chara

Alphys Höek CHAPTER 5

Sans screamed in japanese at the top of his nonexistent lungs in a fit of pure blind rage, summoning his gaster blasters and firing a shitstorm of laser beams at chara. "determination...punnnch!"

Adorable, Glasses, Insanity, Lizard

Hidden

Alex felt almost like a turtle on his back as he landed on his wings and gaster, but he gasped even wider as fargo crawled on top of him and began to move in.

Alien, Anal, Dark, Gay, Insect, M/M, M/solo, Oral, Oviposition, Sci-Fi, Transformation, Wasp, infection, paralysis, self suck, tf

Into This World

His gaster was practically throbbing as it wobbled behind him, glistening in the light. cameron was still a little more hesitant, taking it all in. "and what am i to guard?"

Alien, Bug, Corruption, Docking, Egg, Hyper, Insect, M/M, Oviposition, Scifi, Transformation, mpreg

Lemon Fed (Undertale)

Lemon fed about a month had passed in the underground since the day when the quite frankly horrific results of alphys' now-infamous determination experiments had occurred, and yet still, not a single monster in the entire underground besides her, sans or gaster

Acid, Adorable, BDSM, Bestiality, Blush, Bondage, Breastfeeding, Comedy, Cumshot, Cute, Digestion, Domination/Submission, Erection, Fat, Fingering, Food Play, Foot Fetish, Glasses, Horror, Humiliation, Humor, Insanity, Licking, Lizard, Love, Master/Pet, Masturbation, Parody, Penetration, Rape, Romance, Satire, Scalie, Sex, Size Difference, Straight, Teasing, Tentacles, Vagina, Video Games, Vore (hard)

Underfoot Fetishtale

"oh, for the love of f%#&, gaster, did you really have to go magically implanting foot-fetish chips into everyone's brains today?"

Adorable, Adorkable, Alphys, Anthro, Asgore, Asriel, Bisexual, Blowjob, Blush, Breastfeeding, Burgerpants, Caprine, Cat, Catgirl, Creampie, Crossdressing, Cumshot, Cute, Elderly, Endosomatophilia, Erection, F/F, Fanfiction, Feline, Fellatio, Fetishes, Fish, Foot Fetish, Footjob, French Kissing, Gaster, Gay Relationships, Gerson, Glasses, Goat, Goat mom, Group, Humiliation, Incest, Lesbian, Licking, Lizard, M/F, M/M, Masturbation, Mature, Mind Control, Mother, Muffet, Nice cream guy, Nudity, Orgasm, Orgasm Denial, Orgy, Papyrus, Pedophilia, Penetration, Revenge, Rule 34, S&M, Sans, Scalie, School, Seduction, Shrinking, Size Difference, Socks, Sweat, Teasing, Tickling, Tits, Toe Wiggling, Toe sucking, Toriel, Torture, Turtle, Underage, Undertail, Undertale, Underwear, Undyne, Various Species, Verbal abuse, Video Games, Virgin, Vore (soft), Voyeurism, WORSHIP, brain, giantess, gross, mouthplay, pie, shipping, soles, stomach, stomping, toes, weird

A Khajiit in the Woods

Shadow started to fuck the khajiit's ass harder and gaster, letting out soft grunts and moans as he enjoyed the tightness of his bitch's hole. d'arq shivered and felt his balls tighten.

Anal, Argonian, Big Cock, Blowjob, Bukkake, Chubby, Cum, Feline, Forced, Forced Sex, Foursome, Gang-Rape, Gay, Khajiit, Lizard, M/M, M/M/M/M, NC, Oral, Rape, Skyrim, scaley, the elder scrolls

An Experiment Gone Wrong? CH. 3(Rewrite)

In the morning you awaken to find yourself staring at Asriel, he's still sleeping peacefully, mouth slightly agape with a bit of drool pooling onto the pillow. You can't help yourself as you give a quiet chuckle so not to disturb him. You do your best...

Asgore, Asriel Dreemurr, Frisk, Gaster, Hurt/Comfort, Named OC, Papyrus, Sans, Toriel, Undertale, Undertale AU, Undyne, chara