If the slugs themselves are in a relationship it would be epic. Imagine them wearing K-pop anime clothes and hairdo, even glasses for the "uke". Ok, I'm just kidding. Hm thinking about BL common tropes... Well, of course, all stories are different, but yeah some situations can repeat. I think that is very common that the dominant partner saves the "weaker" one from bullying/asault/ being hit by a car. Or they are opposites: Loud/quiet; Confident/shy; Rich/poor; Popular/ looser, Seme/uke. Or the seme is a complete asshole and thye didn't like each other until...they discover a childhood secret that completely justifies he is that much of a d*ck! He starts showing that deep down he has a heart of gold ( same clichè applies for Shojo and doramas XD)