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Tooru doesn't understand how it happened. Well, okay, she kind of does. People sometimes forget, or don't even notice she's there. She doesn't take offense, of course, it comes with being invisible, and it does have its perks.
Like sneaking to the front of the lunch crowd. Or not having anyone know when you're having a bad hair day. Or even learning some really, really juicy gossip.
She thought Bakugou wanted to beat Todoroki up, because Bakugou wanted to beat everyone up. And that Todoroki was just kind of staying away from Bakugou in the same way people stayed away from tempests, or forest fires. Apparently not.
She's hurrying back to the classroom after the day had ended, having forgotten her notebook, when she comes across a scene that makes her stop dead in her tracks. Bakugou has Todoroki pinned to the wall, hands around his neck. Meanwhile, Todoroki's left hand is fisted into his aggressors' hair. Tooru doesn't have time to think about the inappropriate closeness, or the way Bakugou's eyes flutter down to Todoroki's lips. Instead, she sees nitroglycerine explosions and left-side fire and her mind immediately goes for the worst possible outcome: they are going to burn the school down. She prepares to scream for a teacher when her voice dies in her throat as Bakugou mashes their lips together.
They don't see her, and she watches speechlessly as Todoroki fails to punch him in the balls and instead responds by enthusiastically kissing back.
Well.
The first time was an accident, but the second one is definitely morbid curiosity. When they say curiosity killed the cat they aren't wrong, because the second time is a lot less juicy gossip and a lot more never-ending regret.
It's right after Foundational Hero Studies, so they are still wearing (or in Tooru's case, not wearing) their suits. The three of them have cleaning duty, and when Tooru loudly announces she's finished her share and she's heading home, they seem to tacitly accept that she did. She shuts the door but instead stays inside and hides behind the front desk.
Both of them dutifully finish mopping the floors before any of them says anything.
"Want me to blow you?"
"Yes."
Tooru has never properly appreciated Todoroki being a quiet kind of kid until now, but by time she is able to escape the classroom, she has still learned by sound and sound alone that Bakugou a) is an enthusiastic slurper, b) swallows, and c) is definitely into Todoroki.
The third time, she walked in on them wrestling, thought it was normal and went to retrieve her school uniform, when wrestling turned into wrestling, lewd noises and jerking hips included.
The fourth time, she was resting at the infirmary when they both got brought in. Seeing as they were already half-naked, little time is wasted before things get steamy in the messy, fumbling teenage way.
"That was nice."
"Say that again and I'll rip your tongue out of your skull."
Todoroki laughs, but Tooru mentally consoles herself with the image while weeping for the death of her mental innocence.
By the fifth time, Tooru is wondering if she should get herself a kitty bell.
So, okay, she really should have said something. Really.
…Except like, no?
The two most dangerous guys in her class were banging, and seemingly very intent on keeping it hush hush. Tooru certainly didn't want to be the one to ruin it for them. Because while she couldn't imagine stringing together hey so I deliberately spied on you and accidentally saw you sucking off Endeavor's son, and I think I triggered some sort of karmic retribution because now I keep walking into you putting your hands in each others' pants or any other similar sentence, she could imagine Bakugou blowing her ass all the way to Neptune, or maybe stringing her up and roasting her like a hog. And she could definitely also see Todoroki watching over the proceedings calmly, maybe joining in to make sure she was evenly cooked, and then freezing her into a nice little ice cube and dumping her into the nearest ocean.
Honestly, anyone else would have done the same. She's not a pervert. It's not her problem. She tries reassuring herself before homeroom, as Ochako and Midoriya chat.
"You have been getting along better with Bakugou recently, have you not, Deku?" Ochako says.
"Honestly, I think he just swapped trying to kill me with trying to kill Todoroki."
"That's fairly suboptimal…" Iida chips in, looking dubious "he's looking at Todoroki like he wants to bite his head off."
"Oh he certainly wants to go for the head, but I'm unsure of if he wants to bite," snaps Tooru, and as her friends turn to look at her, she bursts into uncontrollable giggles.
What is wrong with her.
Thing is, they are kind of… (oh god, could she dare say it?) kind of… cute.
That day during lunch, Todoroki drinks his juice in slow, measured sips, and Bakugou forgoes a spoon for his meal, eating with chopsticks at a torturously slow pace.
"You do realize curry is liquid," Todoroki deadpans.
"It's not my fault it's not just your attacks that have the accuracy of a pregnant mammoth," Bakugou shoots back. "Some of us are trying to work on our finesse."
Todoroki dabs a napkin at his mouth placidly. "Wow, two full sentences and no swearwords? Someone has been reading the dictionary."
"Fuck off, asshole." Bakugou flips him off, but under the table he shifts his foot and rests the toe of his boots against the other boy's, the smallest point of contact.
After math class, while they wait for All Might-sensei to arrive and despite being sat right in front of Yaoyorozu, Todoroki walks over to Bakugou's desk to consult him on a question. This surprises Yaoyorozu, and she walks over and offers assistance, only to have her concerns waved away by Bakugou's it's fine, it's really fucking easy.
Tooru has to begin furiously chewing on her pencil to stop herself from cooing.
Okay, so she said she was going to keep it quiet. Tooru can't help herself! She's a naturally chatty person! Young love is blossoming in front of her eyes!
So when for two full weeks, she stops running into their hormone-driven sexcapades, she starts to worry. When Tooru cross-references that with Todoroki's sudden sullen withdrawals from conversations, and with Bakugou acting like even more of a raging asshole than usual, she finds a correlation and the truth strikes her.
They got into a fight.
And while Bakugou is still a jerk, Todoroki has been so sweet recently, she feels like he's less likely to burn her alive if she tells him she may have overheard them. Most importantly though, she feels like having heard the sound he makes when he comes multiple times means she has some sort of moral duty to give him a metaphorical shoulder to cry on if his boyfriend is being a dick instead of touching one. She's invested, dammit. So one morning, when Todoroki is looking particularly gloomy about his own existence and she's feeling particularly brave, she approaches him during homeroom.
Disclaimer: She went to a concert with Kyouka last night. Her hearing is a little off, maybe. Tooru never did have the best timing.
"IS IT BAKUGOU?" she whispers conspiratorially. Todoroki flinches, "Excuse me?"
"HAS HE BEEN HOLDING OUT ON YOU?"
"What?"
"SEX, TODOROKI, I'M TALKING ABOUT SEX. I THOUGHT MAYBE YOU WERE FRUSTRATED YOU WEREN'T GETTING ANY, ESPECIALLY AFTER THE PAST FEW WEEKS BECAUSE BOY HAVE YOU BEEN BUSY. I'VE KIND OF WALKED IN ON YOU AND BAKUGOU GOING AT IT A COUPLE OF TIMES, BUT BEING INVISIBLE AND ALL YOU GUYS DIDN'T REALLY NOTICE. IT HASN'T REALLY HAPPENED RECENTLY, AND YOU'VE BEEN LOOKING KIND OF DOWN, SO I HOPE EVERYTHING IS OKAY WITH YOU TWO."
The classroom is by now deathly silent, but Tooru does not realize this. Despite her ruined hearing, she does notice three things, which happen in rapid succession:
1) Todoroki's face goes so red his healthy skin is now indistinguishable from his burnt one. It's actually kind of fascinating and Tooru would like to take a picture except 2) behind her she faintly hears an incoherent screech of rage and a squeal that vaguely sounds like wait Kacchan! just before 3) a desk is thrown straight at her face.
However, Tooru is a hero in training, thank you very much, and being invisible means squat if you don’t have the reflexes to avoid distasteful surprises, so she of course dodges. When she turns around, Bakugou is holding his ruined, burning notebook and smiling in Tooru's general direction in a way that says I am going to blow your atoms to fucking pieces. She takes a look around, her gaze landing on Kyouka. Her friend points to her ears, mouths at her 'you fucked up'.
Tooru looks at her classmates, their eyes going wide as saucers as they stare at Todoroki and Bakugou in disbelief, and gulps.
As she starts rapidly discarding her uniform, the classroom temperature drops dramatically.
God. Tooru is never wearing clothes again.