Not at all, it's fully natural
I hardly ever plan the pairings in my stories, they come naturally, and because they are such good matches, of course I ship them - otherwise I couldn't write about it!
Also, I'm still in love with the ambivalent mysterious guy from my first novel, which I wrote when I was 16 (and which will never be published because reworking it would take more effort than writing a new novel ... and now he's miiiiine! Miiine alooooooone!
) - now THAT is embarassing!