Lets start at the beginning of how Bruce and Kal (AKA Clark) met.

When Lois and Clark are assigned with an interview with Bruce Wayne, Clark has a strange feeling in his stomach when he's around Mr Wayne. And what do you know? HE'S BATMAN. With the two Superheroes' identities revealed to each other they become closer than co-workers for justice. And soon Clark has another feeling in his stomach when he's around Bruce... Love.

when superman and batman came back from a mission to stop a criminal there feels change. batmanXSuperman. the characters are not mines but the story is mines.