Optimus

- He had taken you out on another romantic date

- He asked you if he could kiss you

- You said yes and he pressed his lips to yours

Ratchet

- He was in his holoform while you both were out on a walk in the park

- He asked you if he could kiss you

- Instead of answering him you wrapped your arms around his neck and kissed him

Bumblebee

- You both were watching a movie

- When a kissing scene came he asked you about it and you told him what kissing was

- He then pulled you in for a kiss

Arcee

- She had asked you if she could talk to you in private

- She was a stuttering mess

- You kissed her and she stopped stuttering

Smokescreen

- He had taken you to the carnival

- You both were at the top of the ferris wheel while watching the fireworks

- He suddenly pulled you in for a kiss

Bulkhead

- Miko had made everyone play spin the bottle

- When it was your turn the bottle landed on Bulkhead

- When you kissed Bulkhead Miko took a picture

Wheeljack

- You both were completely alone at the moment

- He pulled you close to him and looked into your E/c eyes

- He squeezed your butt as he kissed you