The next day, Sarina is back in Donatello's lab. She has a notepad before her on the table, her neat, simple printing adorning the page as she scrawls out the emotions that she has already learned.

Sarina puckers her lips, tapping her pen on the paper as she counts. Her eyes widen and she turns her chair abruptly towards Donatello, who reads a novel in silence with a coffee mug lingering near his awaiting hand.

"Donatello, I have discovered something," Sarina says.

"Do tell," he states with hardly a glance.

"I have learned more than double the positive emotions than negative," she says, lifting the notebook and jabbing her finger at the list. "I need to be a well-rounded individual, so I must balance out all types of feelings."

He looks up from his book, reaching for his mug and bringing it to his lips. "How are you going to do that?"

She smiles, the gesture far more natural than ever before. "I'm going to spend time with Raphael."

He nearly chokes on his coffee, gasping and squeaking as the hot liquid scalds his throat and tongue. Sarina's eyes widen and she moves to him as he sets the mug down hastily, fanning at the tears in his eyes as he coughs, tongue sticking out in an attempt to cool it.

"Are you alright?" she inquires.

"You are volunteering to hang out with Raph?" he repeats, ignoring her question. "Raph doesn't just...do that."

"That cannot be true."

"He only hung out with Destiny for the first time when Splinter forced him to."

Sarina blinks. "Fair, but it's still worth a shot. I need to learn anger." She shrugs. "I will see you later."

She turns and strides out of the lab, leaving Donatello to his own devices. Outside, Sarina can see the silhouettes of two people training, but judging by the fact that one shadow belongs to Destiny, Sarina ventures a guess that the other mutant is Leonardo. Michelangelo is playing video games next to a cat made of ice cream, something that serves to catch Sarina off-guard. Despite that, she decides not to question the feline's presence.

"Michelangelo?" she asks. "I hate to interrupt, but have you seen Raphael?"

"Nope! Sorry, dudette," he says, fingers flying along the controller buttons. "Try his room or something."

"I shall. Thank you."

On her way to the bedroom hallway, she realizes that she has no clue which bedroom belongs to Raphael. She resorts to going to each door and peeking inside, hoping that the decor in each bedroom will tell her about the turtle it belongs to.

Bedroom number one is incredibly neat. The bed is made and there are multiple ninja movie posters on the walls. Space Heroes figurines line the scant shelves. Leonardo, Sarina guesses.

The second bedroom is the exact opposite of the first, consisting of an array of junk and hidden treasures nestled amongst old pizza boxes and actual trash. Sarina is quick to back away from Michelangelo's room.

As she reaches the next door, she can hear a faint squeaking resonating inside, like plastic material rubbing together. She listens in closer, slowly pushing the door open as she does so. Inside, Raphael sits on his bed with an action figure in each hand. His shell is turned to her, so he doesn't notice her presence before she walks in like she owns the place.

"Hello Raphael," she greets.

He spins around, eyes wide. "What? Sarina, you can't—I don't—GET OUT!"

He chucks one of the figures at her. She catches it right before it hits her in the face, an unfazed look flickering to the toy as she lowers her arm.

"These are cute," she says.

"Action-kick Unicorn Man is not cute," Raphael snaps, crossing his arms over his chest.

He gets up, storming over to her and snatching the toy from her hand. He glares at her, trying to look intimidating as he squares his broad shoulders and bares his teeth, but she doesn't flinch or cower from his glare.

"Thank you for being angry. I am learning a lot," she comments.

His face slackens. "Huh? You're...thanking me for being angry?" He shakes his head. "Honestly, you are something else."

"I was hoping to spend time with you in order to learn more about being human. Anger is a part of that, is it not?" She tilts her head, one hand resting on her hip.

"Uh...yeah, I guess so," he mutters, pursing his lips.

"Good. What shall we do together?"

He laughs a little. "Listen, giggles, you and I wouldn't get along. You're a brainiac and I'm a hothead. That doesn't mix."

Her pale eyebrows knit together. "Did you call me...giggles?"

"Yeah, I did," he says, still eyeing her with slight confusion.

"I do not know how to laugh. How can you call me 'giggles' when I do not know how to giggle?"

He exhales and rubs the back of his neck. "Well...just because your name means 'one who laughs', I...enjoy the irony, I guess?"

"You make a lot of guesses. Do you ever know anything for sure?"

He narrows his eyes. "Yes, like I know that you won't want to hang out with someone like me."

He grasps her shoulders and tries to push her out of his room, but she refuses to budge. She plants her feet, making it extra difficult for him to move her. Her eyes flash as she gives him an almost pleading look.

"I am very curious about your so-called hotheadedness," she admits, "and I do want to spend some time with you. Can I please keep you company?"

His face hardens, but her eye contact doesn't shatter. There's a few beats of silence and neither mutant backs down. Finally, he caves.

"Fine, but if you want to learn anger, we're taking this seriously," he says. He ushers her out of the room and they head for the living room. "So, what annoys you?" he asks as they walk. "What gets your blood boiling?"

"I do not know."

He stops and turns to face her. His entire face scrunches up as he strokes his chin, eyeing her closely. "Hm..."

She bows her head. "I suppose this won't be as easy as I originally expected."

"Nope, but we're gonna figure this out," he promises. He smirks wickedly, a glint in his eye. "Come with me, we're gonna find every annoying thing we can think of and see if any of it really grinds your gears."

"I do not have gears, but I see why you would think that."

He sighs. "After you've learned anger, I'm gonna teach you about figures of speech."

----------

Sarina and Raphael spend an extended amount of time trying to find something to trigger Sarina's unknown rage, but nothing works.

Michelangelo sits in front of the pair, rambling on and on about whatever he can think of while bouncing and laughing and making silly noises in between. Raphael eventually hunches over, groaning as he covers his ears, and looks to Sarina.

"Annoyed? Angry?" he asks.

She shakes her head. "No."

He makes a frustrated grunting noise in the back of his throat and drags her off to the kitchen. There, he makes himself a bowl of cereal and proceeds to eat it with as many loud noises and open-mouthed smacking as possible. Sarina sits across from him and observes until he's drained the bowl of milk, slurping the entire time.

"So?" he demands, smacking the bowl down and wiping the milk moustache from his lip. "Annoyed?"

"I am more saddened that you did not offer me any cereal," she admits.

After getting her a bowl of cereal, they go into the living room, where Raphael coughs loudly without making any effort to cover his mouth, then proceeds to crack any joint in his body that he possibly can. Sarina stands next to him, nose slightly wrinkled. He finishes and eyes her, waiting for the verdict.

"That's very unsanitary, but I am not angry," Sarina states. "And doing that to yourself can cause arthritis."

He groans.

----------

Sarina sits in front of Donatello's laptop with Raphael and Donatello standing nearby. The three of them wait for the page to load, but it keeps buffering and the loading bar only reaches halfway along the URL before stopping. Sarina tries clicking around the screen and refreshing the page, but nothing works.

"I'm getting annoyed just watching it," Donatello mutters.

"But is she?" Raphael asks.

Sarina looks up at them, a slight frown on her lips. "I am more disappointed than angry."

"Okay," Raphael sighs. "Back to the drawing board."

----------

Raphael keeps trying everything he can think of. He gets Sarina to stub her toe on the pinball machine. He has a very loud conversation with Casey over the phone while Sarina watches TV. He gets Sarina to read a book and then proceeds to hover over her shoulder and read that way the entire time. They go out into the sewer tunnels and stand near some flies until Raphael gets sick of their incessant buzzing, at which point they return home.

He gets Sarina to open up an over-packaged kid's toy and has a full conversation with her over text entirely in acronyms, but nothing is really doing the trick.

"Raph, why are we doing this?" Leonardo asks.

"Trust me," Raphael says. The four turtles and Destiny stand in a horizontal line across the lair floor, leaving Sarina behind them. "Now, Sarina, we're going to walk really slow and you need to pretend you're in a hurry."

"Alright," Sarina says.

The five teens start to walk at half their normal speed. Destiny even pulls out her phone and starts scrolling. Sarina tries to get around them but finds no luck. Eventually, she elbows past them, and that's when Raphael again asks if she's annoyed or angry in any way.

She shrugs. "I am slightly inconvenienced, but I'm alright."

Raphael turns and rams his head against Leonardo's shoulder in defeat. Donatello and Michelangelo give their brother comforting pats on the shell.

"Here, dude, have this coaches' whistle," Michelangelo offers, holding it out to Raphael. "It'll make you extra professional."

----------

Raphael stands outside the bathroom with Sarina before him. "Alright, what you're going to do is go and have a shower."

Sarina blinks. "That seems fine, but why now?"

"Simple, everyone else in the lair has already had one and the chances are that you'll run out of hot water. Now go! Shower!" He blows his new whistle and Sarina rushes into the bathroom.

Five minutes later, she reemerges. She is dressed in her regular clothes and the only sign that she showered is the fact that her few strands of hair are wet and her bald head is shiny.

"Annoyed?"

"That was bound to happen. Besides, I found that the cold water suited me better," she says.

Raphael throws his whistle across the room, accidentally beaning Michelangelo in the head.

----------

"Okay..." Raphael sighs. "So we tried getting something in your eye, we tried mumbling, we tried public displays of affection but Des and Leo weren't up for that, we tried burning your food—"

"Like how Destiny burnt those waffles," Sarina says with a small smile.

"Yeah. We even tried bad hair days, but we're both bald and Destiny doesn't care enough about her hair to notice." He slumps against the kitchen table. "You're so patient with everything. I was an idiot to think that this would work," he grumbles.

"Patience! I have a new quality!" she chirps, clapping her hands together as her eyes flash rapidly. Her tiny smile doesn't match the perky tone of her voice.

"That wasn't the point! You were supposed to get angry!" he snaps. Her face lapses back into neutrality as he lets out an exasperated groan. "I give up. I'll be in the dojo."

He storms off. Sarina slides off her chair and hurries after him as her expression switches to that of a kicked puppy. She follows him right into the dojo, where he drops down and starts doing push-ups. She watches him for a few seconds.

"Raphael, I haven't learned anger yet," she says.

He lowers himself almost completely to the floor. "Your problem." He grunts as he hoists himself back up.

"I refuse to accept that."

"Well, you're gonna have to. Suck it up, giggles."

"I am not giggles. I am Sarina."

He doesn't answer. He just keeps doing his workout. The cyborg crosses her arms over her chest and stares down at him, waiting for the response that will never come. Her gut twists.

"Raphael, answer me."

Nothing.

"I do not appreciate you ignoring me."

Still nothing. The turtle starts doing push-ups with one arm instead of two. Sarina's eyes flash and her teeth grind together. Her heart starts to pound and her entire face flushes with heat as she starts to stew in her thoughts, remembering the cold shower and stubbing her toes and working with a slow computer. They didn't bug her at the time.

"Raphael, answer me this instant or...or...I don't know, but something will happen!" she snaps, raising her voice for the first time. Her eyes flash rapidly as she raises her fist.

Raphael stops his workout and looks up at her, eyes wide. A second later, his face breaks into a smile and he laughs. Sarina's face falls and her fist unclenches, shock wiping her features clean.

"What? What is wrong?" she demands.

"You got angry!" he nearly shouts. He leaps to his feet and thrusts his fists into the air, laughing again. "Yes! Take that, emotion! IN YOUR FACE!"

"I am so confused," she murmurs.

He turns to her. "I am so proud of you right now," he says. "And if you tell anyone I said that, we'll have a problem."

"Proud?" Her eyes flash again and she smiles with all her teeth. "You are proud of me for being angry! That is wonderful!"

She throws her arms around Raphael's neck and he nearly falls over, face slackening. "Woah!" he yelps. "Why are you hugging me?"

"I can't help it! Nobody has ever been proud of me before! What is this feeling?!" she cries, the smile still brightening her entire face. "I am so happy!"

He turns completely red and starts to laugh again, returning the hug in such a way that she's lifted off her feet. "This is the strangest thing I've ever done!"

She hugs him even tighter, squeezing her eyes shut. "I have learned anger, and because of it, I have learned happiness. Thank you, Raphael, thank you so much."

He sets her down and nudges her arm with his fist, suddenly far more awkward. "Uh...yeah, you're welcome."

"I must tell Donatello everything except the pride thing you mentioned before!" she announces. With that, she races out of the dojo, leaving Raphael alone with his myriad of confusing feelings.