I wasn't going to add this, but as I was writing it, it became funny. I'm talking about later on, you'll understand when you get to it, let's just say Smokescreen suggests something, Miko said something everyone became confused and Ratchet explained a few things then Sundown decided to do some research on humans, by the way, all I'm 3rd POV.

The beginning was going to be added regardless but the ending (I'll say where it begins) I wasn't going to add but I thought was a little funny so I did.

Human Biology VS Cybertronian Biology

Sundown stood at the ready, unseeing as she held her gun close to her.

She heard the soft sound of movement as she turned around, aiming and firing blinding as she heard someone yelp.

She ignored it, stopping her weapon as she turned her helm slowly, listening carefully.

She heard the running of pedesteps, coming from her side as she then heard a melee weapon being unsheathed.

She drew her arm-blades, raising them as she heard the clang and felt the weight of the opponents weapon.

"Good."

The weight disappeared as the melee weapon was put away, she also put away her blades as she tore off the blindfold, seeing Arcee in front of her, nodding with a small smile. "You definitely pay attention to your surroundings."

Sundown rose an optic-ridge, crossing her arms, "I was blindfolded, I needed to rely on my audio surroundings to find out where the attacks are coming from."

The Decepticons were growing stronger, but lately there has been no activity with the opposing forces, Optimus predicts they are working on growing stronger, therefore the Autobots need to do the same, with many different training exercises with each other.

"Have you done this type of training before?"

"A very, very long time ago."

Arcee nodded, this training was hard, she had never seen anyone complete it as easily as Sundown, aside from the gladiators of course.

"Gladiator training?" Arcee asked.

"You got it." Sundown spoke, placing the gun she was borrowing on a table, she still needs to get use to the long-range weaponry, she did prefer melee weapons. "And a bit of assassin work."

"I will admit though, your shooting is scrap." Arcee informed her.

Sundown laughed, "oh I know. I hate using the things."

She then begin to mutter to herself, optics suddenly distant and wide as she stares at the blank wall.

Arcee frowned, waving a servo in front of her optics "hey, you okay Sun?"

Sundown shook her helm, recovering as she nodded, "yeah, I'm fine." She smiled, hiding the pain behind her optics. "My turn to train you now?"

Sundown, the only one who specialised in assassinating were trying to help the other Autobots learn to hide and stalk from the shadows, and to strike without anyone seeing.

Arcee got the hang of it pretty easily, still needs a lot of work but she's the one who is the best at it from the other Autobots, Bulkhead just couldn't be silent, he does have a big frame - and is also very clumsy - so it doesn't help him in anyway.

Optimus was too tall and wasn't small enough, you could see him from miles away, Bumblebee wasn't too bad, Ratchet didn't even bother, Smokescreen couldn't keep his damn vocaliser off if he tried, but it was Arcee who excelled.

Femmes were normally smaller then mech, with also lighter frames, making it easy for them to move around without making noise and attracting attention.

The exercises Arcee had used were apart of what training assassins used, but many others used it as well. Relying on your audio-receptors and not optic-sight, was a hard thing to learn but assassins needed it.

"Yeah, what we going to do?"

Sundown thought for a moment, she had trained, but never taught how to train another assassin - or future one. "I really don't know." She frowned, she had also never taught anyone anything, purposely at the least.

"The only thing I can think of is going someone outside of base and having several others with us, that way you have to sneak up on us all. I heard Jack say something once, 'more ears the better'? Oh, I don't know."

"Well we aren't allowed to leave base."

Sundown nodded, "exactly, so we can't really do it."

*Added Part From This Point On*

Arcee nodded as they began to leave the training area, entering the main area, Smokescreen exclaimed, "took you long enough! Geez! What were you guys doing in there?"

Arcee rolled her optics at the unfinished statement, "that's all males think about!" Miko suddenly exclaimed from the couch, turning her head as her pink tipped ponytails bobbed.

Jack also rolled his eyes as Raf sat there, extremely confused as with most of the Autobots.

Ratchet 'cleared his throat' and looked at Miko, "Cybertronian biology is completely different to Human biology Miko."

Now curious, she jumped up, running over to the railing and putting her hands underneath her chin. "How?"

All of the other Autobots groaned, they didn't want to go through the same thing they had to when they were all younger, Bumblebee - who was out with Optimus - was the youngest therefore heard it much recently then everyone else.

Let's just say Ratchet and Optimus had to explain a few - um - things to him. The youngster somehow knew all about human sexual biology, yet not Cybertronian and was very confused with a few things.

Everyone began making their quick leaves, as Sundown tried to block out the talk with Ratchet and Miko and focused on Raf playing a video game.

"What's it called?" Sundown asked curiously, when Raf looked at her, she pointed to the screen.

"Sonic." Raf answered as the character on screen jumped and collected a bunch of gold rings. "It's a mini-game at the moment."

Sundown did a little 'oh' as she watched.

"You guys WHAT!?"

Sundown looked over at Miko and Ratchet, Miko looked scarred and terrified as Ratchet rose an optic-ridge, a smile trying to make its way onto his faceplate.

"Yup, we have both have male and female human sexual organs, every mech and femme process them and -"

"Ratchet." Sundown groaned, "please stop it. I've heard enough about this when I was younger. If you're going to talk about Cybertronian interfacing, then please, take it somewhere else."

Ratchet shrugged, turning away from the wide-eyed Miko and typing across his computer keys.

Sundown looked at the human female, she didn't understand why Miko was so shocked, "oh," Ratchet added, "what you humans call 'homophobia', doesn't exist on Cybertron, same gender pairing are common and not unusual."

Sundown frowned, on Earth were they not? She left the room, entering hers and opening up one of her datapads, she had brought a few back on Cybertron when she got a job. Before accessing the Internet and researching.

When the screen had loaded she threw it across the room and shrieked in terror. What the frag was that!

She looked at the now smashed datapad on the floor, and humans thought their interfacing was weird!

She didn't even know what that was! She didn't care! She was scarred!

Therefore, Sundown rocked back and fourth in a corner until the next day.

~~~
For those who are confused let me explain.

Cybertronians have two main genders and only one sex, sex and gender and two completely different things, sex is what you are biologically and gender is what you are mentally - regardless of sex, Sundown and Darkstinger for example, Sundown is a Femme gender while Darkstinger is a Mech gender, their sex is the same.

For humans they have gender and sex, their gender and sex can be the same, opposite or both.

So while Miko is scarred and confused about Cybertronian biology, Sundown is the same with human biology, because both are a completely different species, Humans don't understand why they all have the same sex regardless of gender, and Sundown doesn't understand the different sex part of humans.

So there you are.

Confused anymore?
Did I help you or make you more confused?

Anyway some stories have Cybertronians like this, others have them like humans, different sexes and genders. Although it really should be different genders same sexes.

Bye for now.