straight is the main problem : http://www.mangago.zone/read-manga/kyuuso_ha_cheese_no_yume_omiru/
it's squel : http://www.mangago.zone/read-manga/sojou_no_koi_wa_nido_haneru/
a bit dark but it's really good
i see. yes i want to punch the straight man but in the squel the gay man's insecurity is the main problem. me too worry about their future. ( ̄∇ ̄") haha .
there are amount yaoi with straight guy. i think this one http://www.mangago.zone/read-manga/hanayome_wa_juunanasai/ also match with your question.
Do you guys know some good yaoi about staright men? Maybe they still love women until they meet each other or the uke/seme thought he's straight till he meet his fated man :")
Thank you so much <3