there is so many! I'll just give my favorites though
The end of breaking dawn-
“‘We have plenty of time to work on it,’ I reminded him.
‘Forever and forever and forever,’ he murmured.
‘That sounds exactly right to me.’
And then we continued blissfully into this small but perfect piece of our forever.”
Edward and Bella's first kiss from Twilight-
“I couldn’t breathe.
He hesitated - not in the normal way, the human way.
Not the way a man might hesitate before he kissed a woman, to gauge her reaction, to see how he would be received. Perhaps he would hesitate to prolong the moment, that ideal moment of anticipation, sometimes better than the kiss itself.
Edward hesitated to test himself, to see if this was safe, to make sure he was still in control of his need.
And then his cold, marble lips pressed very softly against mine.”
The Wedding scene from Breaking Dawn-
“I didn’t realize I was crying until it was time to say the binding words.
‘I do,’ I managed to choke out in a nearly unintelligible whisper, blinking my eyes clear so I could see his face.
When it was his turn to speak, the words rang clear and victorious.
‘I do,’ he vowed.”
And the Meadow Scene from Twilight-
“‘Isabella.’ He pronounced my full name carefully, then playfully ruffled my hair with his free hand. A shock ran through my body at his casual touch. ‘Bella, I couldn’t live with myself if I ever hurt you. You don’t know how it’s tortured me.’ [...] He lifted his glorious, agonized eyes to mine. ‘You are the most important thing to me now. The most important thing to me ever.’”
I love those parts so much. They are definitely the most romantic parts in the whole twilight saga