Play as a CUSTOMIZABLE scientist who catches the deranged attention of a siren while visiting an Arctic research base. 

Game includes:

  • Play as a smart scientist who makes really dumb decisions. 
  • Play as a smart scientist who makes excellent decisions that lead to self-preservation. 
  • Get adopted by a misanthropist socially awkward Dadster
  • Be stalked wooed by a delusional siren
  • Be kidnapped
  • Drive a snowjet! 
  • Race a friendly companion.  
  • Binge watch a series without realizing how much time has passed you by. 
  • Be drowned
  • Enjoy your stay at a five-star arctic research base that has zero casualties so far. 
  • Why do you keep finding bodies--

This is a 15+ romance/horror with an obsessive love interest. Please read the complete warnings list inside the game if sensitive or easily triggered. 

This game has one complete route to a "good" ending, and 9 "bad" endings. 

Siren!Sans belongs to Llamagoddess on tumblr/ao3. AU was used with permission, although adjusted for funsies. (: 

StatusReleased
PlatformsHTML5
Rating
Rated 4.8 out of 5 stars
(255 total ratings)
AuthorDarkpetal16
GenreInteractive Fiction
TagsDating Sim, Horror, Romance, Short, siren, Undertale, yandere

Development log

Comments

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Viewing most recent comments 1 to 40 of 97 · Next page · Last page
(1 edit)

Super cute! Your writing is as beautiful as always, though I'm a little concerned about my tastes now... But Sans is fucking adorable (even if he's a little... unhinged), so I'll give myself a pass on this one. Those scientists were a bunch of jerks anyway. 

Thanks again for such a masterpiece! Only have one complete game left before I move onto the in-progress ones! I'm excited to move on to your incomplete games... And also nervous, because I know exactly how I'll react when I reach the 'end' of those games, and there's no real conclusion. 

But it must be done! For the skele booooiiiiiissss!

(-12)

Would be cool if this was a visual novel, or if it mentioned it was a text based.

(+1)

yall are ridiculous 💀

(-10)

Would be so much better if there was an option to choose gender of the siren.

bro what

(+2)

i like how more extra stories got added. Please keep it up! This story and the characters are so interesting! Oh but i would love to read more of the "horror route" or horror side storys with him x mc :P 

(+4)

I didn't realize that this was a.... *checks notes* yandere siren sans undertale x OC fanfiction game (?) until I started it. Not at all my thing, but you guys do you.

Is it just me, why is the text gigantic

I luv the relationship between the dad and mc

(+9)

Am I the ONLY one who played through the whole game WITHOUT catching the UT references?!? Only to come back much, much later and see all the creator's other games and put two and two together? Roflmao >w<

No like only after I finished it that I realize.

Deleted 80 days ago
(+2)

This game was so good through the options to the story telling please keep up this amazing writing!!!!!!

(+7)

this is one of the best IFs i've ever read! i saw the author's note after the good ending that says you're working on more sans POV and a horror route! i really hope u continue this project bc i'd especially be looking forward to more of sans' POVS :)!!

(+2)

THE FUCKING UNDERTALE REFERENCES. THEY DON'T STOP COMING. HELP ME

hi everyone i wonder if anyone knows the names of the song used in the game, please tell me if you do i'll appreciate 

Here at the start of the game the dialogue says its from dreamscape on youtube!

thank you:D

(+6)

Giggling and kicking my feet while playing this

(+2)

Can someone tell me how to get the good endings because I keep getting the bad endings

(1 edit) (+4)

I just watch this youtuber called Twinkle phoenix and she goes and through this game and gets the good ending plus the 9 bad endings

(+1)

Be delulu. It's literally the solulu in this situation >:(

Tarde en darme cuenta las referencias a Undertale, y cuando lo note fue en el final. 10/10

(+2)

Ill be honest loved the game I really did, although, I accidently completed it on my first try

(+13)(-1)

kiss men :3

(+3)

best comment

(+3)

truth!

(+12)(-1)

This is amazing. I really love it! Your writing is so captivating and I love the characters. I wish it never ended!! have you thought about adding NSFW themes in your stories? 

(+3)(-12)

in what world is this an appropriate question

(+20)(-2)

(+4)

YESSSSSSSSSSS omg this was genuinely so good, and all the bad endings slap. I absolutely KILL for the other perspective at the end. OOF. This is the first game of yours I've played in a while and, as usual, i was not disappointed. HOOO omg time to play through the rest of your games.

(+3)

okay i was nervous to try this at first i didnt know much about the au but i adore the fandom and have enjoyed several of the novels/games made by this creator. But i was pleasantly overjoyed to play and read all of this every bit of this had me hooked and the ending bonuses where just adorable i cant stress enough how much i want to thank Darkpetal16 for making these kinds of games and i cant wait to see everything thats coming next

(+4)

BEST THING genuinely did not think I'd enjoy it this much! at first i was thinking "ok its been years since i had any sort of attraction for any sans, though i still do really like gaster, not in any romantic sense but just as a, he's silly and dorky and cute but also spooky way. I'll play this for dadster" and by the end i was thinking "holy freaking shirtballs! i desperately need more of this! more of the story from sans's point of view! more content from after the story! just more of this!" so, yeah very much enjoyed and i truly hope you make more bonus content or more stories!

(+1)(-1)

it should be antarctic, not artic, if it's the south pole...

(+4)

Love this!

Dadster content <3

Love him

(+4)

FR LOVE THIS!!! Dadster stole my heart since the moment i started playing. <3

(+2)

I LOVE THISSSS!!!! ❤️❤️❤️💋💋💋💋

(+2)

I love this story so much! thank you!

(+2)

Dadster has my whole heart <33

(+7)

There's A LOT of compliments, praises and comments I want to write here about the immersed world building, characters, about main character's reaction of everything and the problems that can relate to daily life but I'm not vast in vocabulary as I am not an eng speaker. But I just want to let you know, I read many interactive novels and fanfics, this is my favourite one so far in this year.

I have zero knowledge in Undertale and thanks to this work, I'm now fully interested. 🙇🏻‍♀️

(+1)

Hi Darkpetal! Didn't see it in the desc. but, is the gender of the RO customizable? TYSM <3

Yes, it is :)

is it? it's always a guy for me

Huh, I must have misread the question. No, it isn't.

Idk wut RO means but ig they meant Sans-?

Yeah, they do. I just misread the question.

(+1)

got the good ending the first try and i shit you not i cried like 12 times your writing is always so good :')

(+2)

oh my god i just went through the whole thing in one night and oh my g o d.i love gaster he almost made me cry and i love our boy and i love the end and i havent been in the fandom in years but im gonna come back to this again oh my gosh this is a blessing

(+2)

fave bonus ending is the tell sans your pregnant.

(+2)

I had literally ZERO exposure to Undertale until I found your games, and now I am OBSESSED. I lovelovelove them. Well-written, well-crafted, just all around amazing. And I can't get enough of the bonus stories, they're so wholesome and cute and full of surprises. 

I still haven't played Undertale, so your games are basically my canon at this point, and I am very much okay with that. ALSO HOLY SHIT I JUST SAW A NEW GAME ON YOUR PAGE GOTTA GO BYEEEE <3

(+1)

i'm not the creator, but this is literally me-- i've played all of your games and not undertale yet--

(1 edit) (+2)

Haha glad I'm not the only one! It's been really fun discovering the world and the characters in so many different iterations, and through such a fun medium.

me too

(+1)

I’m genuinely crying

This is an incredible game, everything is so well thought, i’m impressed…

I just love this so much

(+1)

I LOVE THIS.

(+3)

I got mated ending. So cute with the references from undertales

(+2)

This is amazing I love it, but, I'm deaddd and keep dying, and I don't know what to do. I was lured by Sans when I was trying to tell him I was leaving, can anybody help??

(+4)

Is it the part where it says [you feel scared]? Because if it is then you just have to wait until another option shows up and you click [you don't want to leave Sans] and I think that should do it. GL! Hope this helped! (Or you already figured it out.)

(+2)

This is AMAZING!!! I loved every moment!!

How do you learn to write stories so well?

(+3)

God this was a ride in the best way possible. my gay ass really lucked out LMAO but anyways this was such a delight to read!! I love the fact that we were basically adopted by Dadster !!! I love the Father moments QWQ especially at the start where he was asking bout the stuff we needed to pack. Now I can just imagine a scene where MC jokingly says "Okay, Dad." and Gaster be like: *in tears* you see me as a father???

joking aside, I have to say, the atmosphere while reading this with headphones on was immaculate. even when my eyes were giving up on me i COULD NOT TAKE AWAY MY EYES FROM THE SCREEN!!! i needed to read it and FINISH IT ALL THE WAY. Suffice to say, it was very satisfying to get to the ending and read all the cute bonus scenes <3 

love sirens <3 

- from, a gay monster-romancer who absolutely adores "The Shape of Water" 

p.s: there are some pronoun errors in a few of the paragraphs in some of the bonus scenes [Mostly the ones in Sans's Perspective]. I chose the option that would refer to the MC with he/him and was slightly confused as to why there were she/her instead ^^ this is just a minor nitpick though, other than that, this game is perfect and flawless and it deserves an oscar for fanfiction <3 

(+3)

first time ever making a comment on this website [more will follow as I shall comment on your other works]. at first I was just searching for dating sims, reading the tiny lil summary that popped on the side. didn't even realize it was an undertale au. I simply saw catching the attention of a deranged siren and I was hooked instantly. it was not until I started did I realize that it was undertale.

I am rambling a bit, but I was much to drawn in by chance of a yandere siren, and more so when looking up an image for Siren!Sans. and having an visual really drew me in strongly as a siren's call would lure you to a bad end. 

one thing I enjoyed right away during the character customization was the player being able to choose their soul trait. this led me to become hooked for Kindness for the entire game and others if it was an option. 

for me, I am not the best with visualizing written bits due to not being able to visualize in my head. yet how the game was written, and the story went brought upon having many different feelings, as if I were actually feeling as the character I controlled. from the interactions with Sans [which I loved the visuals given to whenever he spoke, hovering over it had me staring for a couple of minutes as the colors changed] to the relationships that progressed from beginning to end.

speaking on fancy bits to text, I felt like a moth to a flame with how you did the effect for Gaster's text. quite surprised me on the first go [I played the game a second time because I am addicted] and was excited when seeing it in your other works.

honestly this game itself has both brought back into loving undertale [and the lazy bones known as Sans] and also become a bit of a comfort with how you've written Siren!Sans in the game. can't lie when playing your other works, and hearing some voiced parts...I could only imagine a voice being attached to this siren skeleton and I felt giddy as all heck.

after the ending, seeing the bonuses was a delight, and I loved each and every bit to absolute death. with Sans' pov with the encounters with the other humans made me with to see how perspective with the others as I was so curious with what deaths were because of what they did or what they said about the character

also biscuit...I say the word a whole lot and could only snicker using it as my go-to curse word in your works X33

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