7 Works by NumbAssassin
Listing Works
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The Psinner and The Saint by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
13 Nov 2025
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Summary
The sky is crying.
Baby Kokomi doesn’t know why…
Her short, blue hair disappears under the covers as the earth itself trembles from the wrath of god.
Good thing big brother Makoto is here to help…
…right?
Tw // author tries to rationalize this traumatized brother and sister duo’s relationship, so like stuff like implied/possible past sexual abuse and stuff comes up.
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Where Misfits Fit (Together) by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K., One Piece (Anime & Manga)
29 Jul 2025
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Summary
“Weren't those three little demon-spawns bad enough?” Top-hat-monocle-stashe sniffed, the state of whose teeth reminded Kusuo of the pack of bubble-mint gum stored in Mama’s purse.
His friend Snobby-Butt-Chin only sighed as he replied,
“By the Celestial Dragons, it would be in the royalty’s best interest to accelerate the date of the fire”
Okay, Kusuo feels like he’s missing some context here...
“Certainly, cleansing the filth of this country before more mutant trash rise up from the dump is long overdue... by the crown…. floating babies and robot wielding toddlers now..? That stretchy brat was strange enough…”
See, Kusuo’s not an eavesdropping bad boy! He can’t help that he’s got telepathy and that these old guys are gloating so freely after a tiny telepathic nudge!
And that’s so rude of them, him floating isn’t as weird as that dudes stache! Maybe Kusuo should help his appearance with that using his powers…
(Wherein baby Kusuo and Kusuke from Saiki K accidentally travel to the One Piece verse during the ASL flashback and chaos ensues...finally, my babies don't feel so alone in being so superhuman 🥲)
Series
- Part 6 of Baby Kusuo’s journey through infanPSI
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They’ve Alien Appearances by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
31 Jan 2025
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Summary
There are certain beings creeping in the darkness that terrorize even Super Psychic Baby Kusuo.
The Saiki family are forced to face horrifying foes who dare to intercept their family time and scare their precious youngest.
Series
- Part 5 of Baby Kusuo’s journey through infanPSI
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You Want A Piece Of Me? by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
12 Jun 2021
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Summary
Baby Kusuo has his eyes latched on the forbidden, chocolatey treat on top of the dining table.
….all he knows is that he needs it.
Series
- Part 4 of Baby Kusuo’s journey through infanPSI
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Rub-a-Dub-Dub, Psychic in the tub. by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
22 May 2021
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Summary
It is bath time for Baby Kusuo and his Big Brother Kusuke! What a fun new experience for the two superhuman infants.
For Kuniharu and Kurumi? A perfect, three-in-one opportunity to clean, entertain and tire out their sons before bedtime.
Series
- Part 3 of Baby Kusuo’s journey through infanPSI
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It’s The Little Things In Life. by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
14 Apr 2021
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Summary
Newborn Baby Kusuo doesn't understand everything about this new, outside world, but he is learning more, day by day, with his Mama and brother’s help.
Series
- Part 2 of Baby Kusuo’s journey through infanPSI
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Uh oh. by NumbAssassin
Fandoms: 斉木楠雄のΨ難 | Saiki Kusuo no Sai-nan | The Disastrous Life of Saiki K.
12 Apr 2021
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Summary
It’s midnight, and Kusuke notices Baby Ku has escaped his crib.
What could tiny Kusuo be doing, sitting upon their Papa’s chest?
Series
- Part 1 of Baby Kusuo’s journey through infanPSI