So I am going to combine LuaKitsune and aly_hath  ideas into one but if you have an idea for a chapter for this book then feel free to request I do not mind.
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(Y/n) POV
When Optimus dropped me off I went to the attic to put the recordings away. I went straight to my bedroom and went to sleep tired.

Optimus POV
For some reason I cannot get (y/n) off of my processor. I had decided to go to Ratchet about my feeling. I walked towards the Medbay where Ratchet was working. " Ratchet I think something is wrong with me." I said. He stopped working and looked at me. " Sit down and tell me your symptoms." He said. I sat down and told him how my spark beats faster when I am near (y/n), how I get what humans call butterfly's in my stomach. He just laughed and shook it off. " Their is nothing wrong with you, your in love your not sick." I stared at him and nodded. So I just thanked him and left the medbay to go to my birth.

( Y/n) POV
I woke up and gotten ready before Optimus came I put on my new outfit that I had gotten. ( pick above) and left. When I had gotten into Optimus alt mode. When we took off I just look out the window. Once we just took a different route. I looked at the screen and said. " Why are we taking a different route." He ignored my question and went towards a cliff with water at the bottom. He transformed and I landed in his hand. " (y/n) I have to confess something. I seemed to have fallen in love with you. I like your courage and kindness towards the ones that are close."

I stayed quiet to make him nervous I giggled and kissed his lips. " I like you as well." I said smiling .