[@Hylozoist]By all means, include avian romance. It would introduce a new, confusing, and deeply unsettling dynamic to the game. Sounds like fun. 

I heard that the pidgeons in Europe are very aggressive. Not getting out of the way, flying into people, and such. Hatoful Boyfrined: London would probably be like that old ps2 game The Getaway, but with birds. Or that movie Birdemic. 

If the birds ever got frisky and vicious we could always fight them off with coat hangers.