Recommendations shounen ai/yaoi novel with straight couple/s as side story

hi guys,
I brave myself to read the genre/s couple weeks ago and already found few gems; novels with good plot and word building. I would like to have you recommend some titles of the genre/s which have side straight characters, in other words i am looking for novels that not all or majority of character are gay.

hope I can get many recommendations, any setting is ok except involving zombie eating human flesh (eewwww)

thanks in advance

 

I think Faraway Wanderers by Priest should have a straight secondary couple.

 

Thamk you... Check ASAP