sinnerspine
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Conversion by izukusbones
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia
16 Jul 2021
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Summary
From the time they were pups, Izuku was certain he was going to marry Kacchan. They would present as mirrors; alpha and omega, and have plenty of litters. This daydream comes crashing down when both boys present as alphas. Izuku doesn't want to give into the temptation to sin, but Kacchan knows he can convert him, both spiritually and physically.
Written for BKDK Sin Week.
Without warning, Izuku felt the plug that had been keeping the alpha’s cum plugged inside him for the past few hours slowly removed. Warm fluid dripped down his thighs for a moment before being mopped up to lubricate the alpha’s fingers. His hole must be gaping, walls fluttering as it greedily accepted three fingers. It’d never felt like that before, so overwhelming, so good. This shouldn’t feel as incredible as it did. There was a need growing inside him, one he’d never felt before and couldn’t even hope to name.
“That feels good, hah?” Kacchan rumbled, breath hot in his ear. "Don't lie, I can smell your scent sweetening, won’t be long now.”
“Until what?” Izuku breathed before he could stop himself.
Kacchan grinned wickedly. “Until your first heat.”
- Language:
- English
- Words:
- 5,120
- Chapters:
- 2/2
- Collections:
- 7
- Comments:
- 49
- Kudos:
- 2,164
- Bookmarks:
- 327
- Hits:
- 70,092
Bookmarked by sinnerspine
27 Dec 2025
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Chase by bonusbiscuits
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
18 Dec 2025
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Summary
On days when the summer sun was particularly harsh and his sweat ran down his back like a shower of rain, Izuku missed the boy that he was, and like a stray thought that persisted no matter how much he pushed it away, he missed him, too. Though a lot has already slipped from his memories, he couldn't bring himself to forget those piercing red eyes, bright against the white of the snow, and those hands clasped with his that always felt warm no matter how cold the evenings became. Sometimes, on the coldest winter nights, when he was absolutely sure nobody would hear him, he would go out into the forest and whispered his name.
Kacchan.
Offering season has come again.
Izuku, an omega who presented six years earlier than his age group, has been the butt of many cruel jokes from the older presenting alphas. When Katsuki Bakugo, his estranged childhood friend, suddenly reappears during Izuku's seventh season, the omega runs to the woods to escape from what he thinks might be the worst taunting yet. Unbeknownst to him, Katsuki has other plans after all, and the alpha knows that when he finally catches the omega, he's never letting him go, ever again.
- Language:
- English
- Words:
- 12,024
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 5
- Kudos:
- 180
- Bookmarks:
- 27
- Hits:
- 1,192
Bookmarked by sinnerspine
27 Dec 2025
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I Think He Knows (he does not know actually, he’s incredibly slow on the uptake) by 2swim2swim
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
02 May 2025
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Summary
Katsuki is at his lowest. Izuku’s tossed him to the side like yesterday’s news, he’s not even ranked in the top 10, and he’s getting tears all over the interior of his fancy car. Kirishima and co. decide that enough is enough and vow to get Katsuki back on his feet in fixing his love life and his hero career. How? By setting him up on a bunch of dates, of course!
Izuku can’t quite put his finger on why, but he is…less than pleased.
Bookmarked by sinnerspine
26 Dec 2025
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I Had The Shiniest Wheels, Now They're Rusting by noel_0
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
23 Feb 2025
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Summary
“Cold?” Bakugou teased, eyeing Deku.
“Yeah.” He couldn’t let Bakugou figure out what was happening. Or any of the others, for that matter. Maybe he could tell Todoroki since they had always been close, but Deku didn’t want anyone to know how weak he really was.
“You good, man?” Sero asked, leaning forward to look at him better. “You seem a bit pale.”
“It’s the lighting,” Deku deflected. He knew Sero was right; he could feel the blood draining from his face as the pain continued on. It had spread from his arm to his entire body. His arm and back were the main things bothering him, but his entire body was throbbing with a dull ache. Advil didn’t do jack shit, and neither did Tylenol.
“I dunno. You look awful. No offense.” Kaminari looked at him, his brows furrowed in worry.
“Yeah, if you’re not feeling well, you can tell us,” Kirishima pressed.
“I’m fine, guys, really. Just tired. That’s all.” Part of him felt bad for lying to them, but it was better than telling the truth.
“If you say so.” Kirishima obviously didn’t believe him, but he thankfully dropped the topic.
——
Or, Deku has a flare-up and tries to keep it to himself.
- Language:
- English
- Words:
- 10,000
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 48
- Kudos:
- 1,231
- Bookmarks:
- 227
- Hits:
- 11,167
Bookmarked by sinnerspine
24 Dec 2025
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heavy shield down by n_r for cluebells
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
28 Aug 2022
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Summary
In the aftermath of a quirk accident, burnt-out pro hero Bakugou finds himself with a faded, patchwork memory—and face to face with his twenty-year-old self.
Series
- Part 8 of call it any name you need
- Language:
- English
- Words:
- 2,311
- Chapters:
- 1/1
- Collections:
- 2
- Comments:
- 44
- Kudos:
- 144
- Bookmarks:
- 28
- Hits:
- 1,512
Bookmarked by sinnerspine
23 Dec 2025