(Y/N)'s little sister not listening to anyone msy have been a good decision for once.
(Y/N) and her family are on a hike. (Y/N)'s younger sister has been lectured and yelled at not to run on the trail, but she continues to run down the trail until she trios and falls. The little girl looks as if she's going to fall right to her death, but she grabs a branch. (Y/N) tries to grab her sister, knowing it's a dangerous move.
"Are you stupid?! This branch can't support both of us," (Y/N)'s sister argues.
Oh, you little witch. (Y/N) thinks, but why argue when they're both going to die?
(Y/N)'s sister holds on to her, though that won't keep the branch from snapping.
Someone pulls the girls up before they fall to their death. Once she knows they are safe, (Y/N)'s sister, lets go of her sister and runs to their mom, crying.
"(Y/N)?" Optimus asks, worried she's unconscious. She opens her eyes and looks at his armor, resulting in a nosebleed, "are you ok?"
Optimus tries not to panic as (Y/N) faints.
"I don't think she's hurt, but I'd rather Ratchet makes sure," Optimus explains.
The family is shocked seeing Optimus but agrees.
Back at the ark, (Y/N) wakes up feeling warmth and realizing she's in Optimus' arms. He's using his holoform and is shirtless. Her mom and dad are relieved (Y/N) is ok while she sees her four older bros smirk at the sight of their sister with Optimus. She blushes, seeing his muscular torso and arms.
"Do you like what you see?" Optimus asks, smiling.
"I... uh—."
Optimus passionately kisses her, resulting in (Y/N) passing out after the kiss. Her sister panics.
"Wake up!" She cries as she shakes her sister.
"For a young child, she seems to know passing out like that can be a concern," Ratchet whispers.
"But doesn't know our sister has a crush," one brother blurts out.
Optimus says nothing, but he knows (Y/N) likes him.
Her little sister not listening brought us together. Optimus smiles. She will realize soon enough.