Unfortunately I can't remember one of those with a happy ending. :/
This one was excellent, but not a happy ending. http://archiveofourown.org/works/280791 (http://archiveofourown.org/works/280791)
This one has the theme of Steve waking early getting in a relationship with Howard. There is some stuff with Tony liking Steve after Howard dies, but I don't want to go into detail to spoil the plot. Again not a happy ending though. http://archiveofourown.org/works/373387/chapters/628129 (http://archiveofourown.org/works/373387/chapters/628129)
Tony ends up in the past and sees Steve and his father having sex. This one doesn't deal with the aftermath,. There is another fic with similiar premise that does deal with the aftermath, but I can't find it. http://archiveofourown.org/works/301426 (http://archiveofourown.org/works/301426)
Sorry none of these are what you want exactly, but mayhaps you'lllike em anyway.
no subject
This one was excellent, but not a happy ending.
http://archiveofourown.org/works/280791 (http://archiveofourown.org/works/280791)
This one has the theme of Steve waking early getting in a relationship with Howard. There is some stuff with Tony liking Steve after Howard dies, but I don't want to go into detail to spoil the plot. Again not a happy ending though.
http://archiveofourown.org/works/373387/chapters/628129 (http://archiveofourown.org/works/373387/chapters/628129)
Tony ends up in the past and sees Steve and his father having sex. This one doesn't deal with the aftermath,. There is another fic with similiar premise that does deal with the aftermath, but I can't find it.
http://archiveofourown.org/works/301426 (http://archiveofourown.org/works/301426)
Sorry none of these are what you want exactly, but mayhaps you'lllike em anyway.