I will say this though, as far as the love at first sight thing goes, I am using Eric and Ariel as the standard since their whole episode was about love at first sight.
I would say they are the cliche love at first sight. But none of our couples–Snowing, Rumbelle, SF, CS, OQ–acted the way Eriel does because they are MAJOR couples. It was love at first sight for Eriel because A and E were only going to spend on episode on them. We didn’t have a whole season to flesh out their TL for each other–like Snowing in S1.
Love at first sight is when a person feels an immediate romantic attraction for a stranger. Feelings can be mutual, but sometimes not as we will see.
I think this is a good definition but by this definition ALL our couples fit into it–even if the denied it for a long time.
So, you were specifically asking about SF–well, about 2 mins after they meet they go for a drink and then (so far as we can deduce) are together from that point on. So there must have been some sort of romantic attraction from the start.
Same with Snowing–remember how they both turned to look at each other. Or how they both went back to save the other when they were in danger? If they didn’t care or didn’t feel something, would they have done that?