Babysitting six kids with your boyfriend can be fun.

(Y/N) is sixteen and the oldest of seven kids. She's the only one who's met the Autobots. Though it was an accident three years ago.

All she wanted is to get away from her then five younger siblings. The classic wrong place at the wrong time got her involved in an alien conflict and a few alien friends. That was a shock enough, but three years later, and (Y/N) has fallen for the scientist, Perceptor. After the debate whether she should say anything because she's a human and he's an alien; until Perceptor planned a science project for the two to do together that ended in the words 'I love you' forming in the pan that Perceptor claimed they needed it, though it was a cooking pan.
"Clever," she smiles.
"I don't care that we are two different species. You know our holoforms are like the human body," Perceptor argues.
There'd be more to talk about, but for now, (Y/N) is happy she can have the mech she loves.

The challenging part of introducing Perceptor to her family wasn't her parents. (Y/N) worried Perceptor wouldn't like her five younger siblings and knowing a sixth terror is on the way, but he enjoyed playing with the kids. (Y/N) is happy she found someone to love and to help babysit.

Two years pass, and the two are still dating and babysitting. Even though now there are six kids to babysit. (Y/N) isn't ready to reveal Perceptor is an alien, but he has an idea how to show the kids his alt mode though he knows they'll think it's a toy.
"You want me to hide as well? You sure?" (Y/N) asks.
Perceptor nods, hoping (Y/N) does not know what he's planning on doing. The oldest of the siblings wonders what's in Perceptor's bag. They couldn't see anything through the unzipped section. They convince their sister to go hide somewhere else while they deal with the five siblings.
"Come on, the basement has plenty of places for you all to hide, and I can see you," the oldest sibling tells the others.

Perceptor heard the kids go downstairs. He knows he still has to search for them in the basement. He's certain (Y/N) isn't in the basement.
Clearly, the older kids helped the little kids hide. Perceptor observes as he's unable to find the younger of the siblings right away. He's amazed it took him twenty minutes to find six kids, and they didn't hide throughout the entire house.

Perceptor takes them upstairs and shows them what he brought. He made it look like he's controlling his alt mode while he searches for (Y/N).
He doesn't have to search long before finding (Y/N) in her room. The kids follow him to her room but watch as Perceptor sneaks behind her and hugs her. (Y/N) still screams until she's looking at Perceptor.
"Did you cheat by using your telescope?" (Y/N) asks.
Perceptor smirks and cups y/n's face.
"Does this answer your question?"
He kisses her, surprising (Y/N), but kisses Perceptor back.
"EWE!" All six siblings say and cover their eyes.
After the kiss, the couple suggests watching a movie with the kids.

The parents return home at nine. Finding all seven kids asleep on the floor. They notice how close Perceptor has their daughter close to him as they sleep. They left everyone alone. Though the youngest kids might wake everyone up early tomorrow morning.