Straight romance: fall in love with x character (or already in love). lots of scenes of the couple being all lovey doves(Maybe sex).Someone comes along to mess things or someone's put in the hospital (someone might go for some revenge) Marriage or Somthing depressing (maybe have kids through A fucked up way)
'homosexual romance: x character already in love (or they fall in love). Sex sex sex sex (maybe Some romance). Someone comes for revenge (someone may be put in the hospital). Have kids through some fucked up way(maybe marriage or Somthing depressing).
Next time well look at pretty much same subject except with triangles.