2nd Lead gets a second chance

Chapter 2 has the brother from the first fall in love with another

Basically a spin off of: http://www.mangago.me/read-manga/okubyou_na_junjou/ (yes the above manga)
All chapters were released at separate times but this manga combines them all

Second couple, the mail man seme is rejected, later gets his own chapter. (As of now those chapters have not been translated)

A spin off of: http://www.mangago.me/read-manga/tsumasaki_ni_kiss/ (which I could not read)
The host in that one is now the MC in this.

God, this is hard to explain but I think I can do it. So the cover couple happen to be the second couple but none the less they are still a couple at the beginning of the story. So the 1st story uke likes the 2nd story uke but then finds out he's already in a relationship but then the 1st uke gets his own love interest. Technically his doesn't fall under "2nd lead" but he kinda do....idk but I think it belongs in this list

Continuation/Spin off of: http://www.mangago.me/read-manga/sensei_no_iukoto_kikinasai/

the nurse from the second book who tried to break the main couple up is now getting a taste of his own medicine. I fucking love it

Uke in the later half originally had a crush (kinda like an obsession tbh) on the uke from the first half.

2nd lead story starts chapter 54

Don't read this if you're hoping a for a legitimate story.... it's basically pwp. Also the ending is unsatisfying

Continuation/Spin off of: http://www.mangago.me/read-manga/thoroughbred_wa_nabikanai/