Sentinel Prime never thought to date anyone, he was too busy with having control over Iacon and giving the Quintesson energon.. Yada yada.
He didn't expect to find himself on a date, with someone he adored; you, his best friend. This date was a movie night, in his pent house of course so he could spoil you.
Pacing back and fourth as he waited for your arrival, he was so nervous but so.. excited! He could not wait to see you, even though he sees you practically everyday. Sentinel Prime perked up the moment he heard you enter his pent house, a goofy grin on his face immediately.
"My baby!" He exclaims, rushing over and hugging you tightly, before he realized this might be a little took much.. maybe not, but still, he backed up. His servos on your shoulders as he shook you gently. "Sorry, can I call you 'my baby'? I don't wanna weird you out or anything.. I mean, you wouldn't mind, right? Maybe?"
The mech already wants to just love you, give you affection and call you his every chance he can take. "Anyways, what movie did you want to watch? We can watch as many as you'd like!"