Their different senses of morality will conveniently keep things from progressing too quickly and sometimes they won't move at all, since the character won't be as fun if they go straight. Compare Go-Karting with Bowser (when the relationship is platonic rather than romantic or sexual), Loves My Alter Ego (for similar relationships between heroes and bystanders), and Defecting for Love (which happens when the Catwoman decides to go straight after all). May lead to The Masquerade Will Kill Your Dating Life if the pairing is ultimately incompatible or too unstable. For double points, they had this relationship in the sequel series as well but in reverse; Silverbolt's spark was in one of their foes and Blackarachnia was determined to convert him as he had converted her.
The same concerns about getting rid of the dramatic tension that fuel Will They or Won't They? The one-sided version of this may be a Villainous Crush.
“We’re supposed to be being collegial tonight, remember? Tell me about this ball we’re going to instead.” Nick shrugged. As far as I’m concerned it’s just another boring charity gala in another fancy hotel ballroom, populated by a bunch of socialites with the emotional depth of a pancake.
Tell me what to expect.” Just then the car stopped. “Too late.” Nick slid across the seat until his thigh pressed against hers. Don’t make me repeat myself.” The heat in his sapphire gaze pinned her to the spot.
When the hero of the show and one of the antagonists have a romantic tone right out in the open, as opposed to Foe Romance Subtext.
This adds a degree of tension to the relationship, and as long as you make sure the antagonist is less of a "villain", we're allowed to root for them.
See Foe Romance Subtext for the less explicit version of this, and Fatal Attraction when it's more dangerous.
However, in both the scenes before and after it was.
They have nothing in common, so naturally they get it together.
A year later and Brett's career is going well, there is the possibility of a job in New York and popularity has gone to his head.
While the premise sounds trite - a scientist (Claudia Karvan) & a talk show host (Pearce) who are complete opposites become lovers, end up butting heads, & eventually switch bodies, learning how the other half lives - it's far from it. Not only do the two leads have the man/woman switch down pat, they also have the individual indosyncrasies of each other down perfectly.
The scenes when they first realize what's happened are some of the funniest I've seen.