Much as I loved BG2 the timing of the romance dialogues were often unintentionally humorous -- for some reason Firkraag's den was listed as "non dungeon" so flirting would inevitably happen there. "I'm wondering, have you ever considered getting married . . ."? Umm, sure I have, but can talk about this after we kill the dragon that is about incinerate us?
Oh yes, my first (and only) attempt at BG2's original romances ended up in a "romantic" scene in the middle of Athkatlan sewers. It was both hilarious and off-putting.
Years later I've found one of the very few (since I generally avoid them in games) romances in crpgs I've enjoyed and it was a fanmade mod. I am not sure if it will be possible to mod companions into BG3, but it would be nice.
