Haha if anything it's the other way around for me; my stories came first and that gave me a taste for certain dynamics, which then makes me look everywhere for stories featuring them 
I'm a sucker for responsible, selfless person x selfish, insouciant person but they kind of switch roles when they're with each other:
Basically, A isn't really evil; they won't actively hurt you, they're just very individualistic and doesn't believe they have obligations to others, whereas B person runs themself into the ground trying to help others every waking hour of their life. But then they get together and B is the only person A will take care of no matter what ('because I feel like it, not because I feel responsible for them or anything', A would say), and B finally allows themself to relax ('if it makes A happy, I guess it's the right thing to do?' B would think) 
(But yeah, if anyone has seen this somewhere, recommendations are very welcome and appreciated XD)