Cybertronian! Insert/Reader

Knockout prefers bigger bots, yknow, the 'heavy duty type'. That doesn't necessarily mean taller bots. Though if you're shorter, he'll definitely tease that.

Maybe it's a security thing, but he prefers bots who can left more then their own share. [Bigger, better]

Just like his frame type, he likes his relationships to develop fast. Sure he'll slow down if you prefer that, but he'll make his feelings and desires known. So LOTS of flirting.

Clingy, and one for PDA, mostly as a dominance thing to scare other bots off. Territorial? Maybe.

Likes to glide his pointed servos over your shoulders and back when passing by, not hard enough to leave scratches, but enough to feel a flick of static electricity trade itself between you two.

Will slide his servos and digits between the gaps of your hips and lower back when simply loitering beside you. He tends to fidget absent mindedly with the mesh and wiring- similar to squeezing a partners love handles or sliding a hand over your lovers ass.

Will expect to be pampered and loved on, though ironically gets flustered with PDA directed towards him.

Human! Insert/Reader

It takes KnockOut a while to even consider being JUST FRIENDS with a human.

Best way to this mechs spark is stroking his primus-forsaken ego.

Still a bit iffy about you touching him, even when you get close. This is due to your natural oil, which he TRIES [not really] to explain nicely that your dirty little mits are covered in. Though soon enough he starts seeing them as little marks he can wear with him when he's not around you! Not that any other bot notices...

He's the type of mech to treat his lil human F/O like a purse dog, SORRY. He carries you around, coz he doesn't want you stepped on OR getting dirty.

Drive in movies are a MUST and he loves having someone to talk to about said movies. Breakdown rarely accompanies him to said movies, so its a welcome change.

He may or may not convince you to pamper the shit out of him. Relating back to point three, he may just say it's what you owe him for getting him covered in your little oily finger prints.

Probably would love to pamper you back, whether not it's healthy, he sees your presentation as an extension of himself. He'd probably somehow get his hands on the finest [most likely red and gold] clothes and accessories.

Would probably pick and prod at you, pet you and overall be all over you.

HUGE flirt, and uses human movies as education on how to court you. It's cringe as fuck, but some how works with his charisma.

Human-ish/Changeling! Reader

Most of what Human! Insert applies to Changeling! Insert. He views you as a interesting "specimen", but ultimately finds you easier to relate to then a plain human due to the shared ability to change forms.

Would be really interested in your species mimicking abilities, and if they also apply to mechanical life [it does, just takes a hella lot of practice!].

With your ability to change form, the size difference that would be seen between a human and a Cybertronian can easily be bridged. Though frankly he prefers when you're smaller, since seeing an organic as big as a Cybertronian, no matter the form is a bit... disconserting.

Doesn't let you out of his sight much. You're not exactly safe around your own kind [humans] or Cybertronians, especially if it's known of your abilities.

He would NOT trust other scientists around you, and especially not human governments. If Megatron or Soundwave knows you're a changeling, then KnockOut is even more fretful.