
I understand why people pre-arrange relationships, too. For me personally, though, it takes away from the beauty and excitement of a developing relationship. Not saying it's bad, just that it's not for everyone.
I just let my characters fall for the other character if it goes that way. My characters essentially write themselves.
I had ONE pre-arranged relationship and that was basically between an established character, and mine was new, and they were just hanging out. The girl character admitted that she had feelings for MY character, who then that he had had feelings for her for the last couple of years TOO (they were in a family unit of gypsies), and that relationship was hard to write. It was fun, but it didn't feel natural. The relationship didn't go anywhere and it didn't feel authentic.
So with that single relationship aside, my characters always develop feelings (or not) as they interact with characters, just like in real life. And it always feels authentic, beautiful, exciting, and great.
It can take anywhere from five months to years for my character to fall for another (my main OC, the silver-haired guy in my avatar pic), but once he does, it's wonderful.
Of course, they run into problems which usually stems from the other person getting very busy and not keeping up communication, even OOCly, and it's a shame, but it does happen.
I just let my characters fall for the other character if it goes that way. My characters essentially write themselves.
I had ONE pre-arranged relationship and that was basically between an established character, and mine was new, and they were just hanging out. The girl character admitted that she had feelings for MY character, who then that he had had feelings for her for the last couple of years TOO (they were in a family unit of gypsies), and that relationship was hard to write. It was fun, but it didn't feel natural. The relationship didn't go anywhere and it didn't feel authentic.
So with that single relationship aside, my characters always develop feelings (or not) as they interact with characters, just like in real life. And it always feels authentic, beautiful, exciting, and great.

Of course, they run into problems which usually stems from the other person getting very busy and not keeping up communication, even OOCly, and it's a shame, but it does happen.