ObsidianSerra
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Recent works
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Summary
You've been living in the underground for most of your life; since you were 8 years old. You were lucky enough to get taken in by the Dreemurrs. They were busy often, so they'd send you to the Royal Scientist's house for his eldest son, Sans, to babysit you since he was already watching over his little brother, Papyrus. You spent a lot of time around them. You started spending more time at their house than at the castle. You'd spend the night often, usually sleeping in Papyrus's room. You were young, so you'd just share a bed. He quickly became your best friend, and you, his. After your younger siblings passed, the Dreemurrs split and you started to rely on the skeleton brothers even more. Not long after turning 18, you chose to go live with Sans and Papyrus. Asgore was upset, of course, but he accepted it and only asked that you visit now and then. Some years later, you're still living with the skeleton brothers. You and Papyrus still share a room and a bed. Neither of you saw an issue with it; you've been sharing a bed through most of your childhoods. You both have trouble sleeping alone anyway. What's the harm in a couple of friends being close?
Recent bookmarks
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You Know What? Hell Yeah. by Anonymous
Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)
23 Feb 2026
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Summary
You stumble back, heart slamming against your ribs. This isn’t possible. You went to sleep in your own world. You remember it clearly—watching Invincible for the millionth time, reading fanfics until your eyes burned, then passing out with your phone still clutched in your hand.
And now?
Now, you’re here.
AKA: You get dropped into the invincible universe and find yourself in the role of Amber Bennett. But you're not Amber. Plus you're down bad as hell for Mark in the real world. You get to live out your fantasy here. Lucky you.
Series
- Part 1 of Girlboss, Gaslight, Gatekeep
- Language:
- English
- Words:
- 153,001
- Chapters:
- 16/?
- Collections:
- 1
- Comments:
- 792
- Kudos:
- 2,638
- Bookmarks:
- 491
- Hits:
- 73,696
Bookmarked by ObsidianSerra
02 Mar 2026
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The House Next Door by BattleMaiden13
Fandoms: Undertale (Video Game), Underfell - Fandom, Underswap - Fandom, Swapfell - Fandom, Mafiatale - Fandom, Mafiafell - Fandom, Mafiaswap - Fandom
03 Jan 2026
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The first time you met monsters you manage to run into four of them and literally run into one of those four. Now they are apparently moving in next door with their siblings and you can't seem to imagine a life without monsters. On the plus side they tell horrible jokes and have endless amounts of energy. So what could possibly go wrong.
Part 1) Chapters 1-138
Part 2) Chapters 139 - ???- Language:
- English
- Words:
- 957,827
- Chapters:
- 203/?
- Comments:
- 5,659
- Kudos:
- 7,985
- Bookmarks:
- 1,155
- Hits:
- 403,287
Bookmarked by ObsidianSerra
02 Mar 2026
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Summary
You get all kinds at your diner, especially working night-shift--but this is the first time you've ever been warned about one.
Just how bad can one skeleton be...?
(An Underfell Story)
- Language:
- English
- Words:
- 32,960
- Chapters:
- 6/?
- Comments:
- 658
- Kudos:
- 2,269
- Bookmarks:
- 471
- Hits:
- 28,579
Bookmarked by ObsidianSerra
02 Mar 2026
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Summary
William wriggled away, his face and ears burning red, the sensation of Mark's lips brushing his neck as he spoke lingering relentlessly. “I have a boyfriend,” he said stiffly, reminding himself as much as Mark.
“You should leave him,” Mark wined, tilting his head and pouting, “he could never know you like I do, never make you feel as good as I will.”
William shook his head. “You don't know me. I’m not the same WIlliam,”
“I know that. But you’re just like him. You look like him, you feel like him, you talk like him. I bet you’d taste like him-”
“Mark!”
“Sorry, William.”
Series
- Part 1 of Invincible
Bookmarked by ObsidianSerra
02 Mar 2026
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Making A Monster by absurdmagewrites
Fandoms: Undertale (Video Game), Underfell-fandom, Underswap-Fandom, Swapfell-Fandom, Fellswap-Fandom, Fellswap Gold-Fandom, Horrortale-fandom, Crafttale-Fandom, Seaswap-Fandom
15 Mar 2026
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Summary
Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster.
A skeleton monster to be precise.
With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure what to do with you, and the others changed, you're ushered into a facility until a monster with similar magic can take you to teach you how to wield the now uncontrollable magic you've been given. After waiting in this place for four years, you'd given up hope that anyone would ever want to take you.
What a surprise for you when you find out that someone does. A lot of someones.
- Language:
- English
- Words:
- 783,125
- Chapters:
- 99/?
- Comments:
- 4,630
- Kudos:
- 4,954
- Bookmarks:
- 1,080
- Hits:
- 296,392
Bookmarked by ObsidianSerra
02 Mar 2026