the uke is a single father (either divorced or the wife died) and he's a major workaholic, trying to support his kid/s. I don't really have anything particular about the seme that I'm looking for, just make sure there's a lot of yaoi-goodness XD

Oh, what a wonderful life it is to those who make it wonderful.

This is the only one I remember where the single father is the Uke and is a workaholic.... It is really great, though.
Sorenari ni Shinken nandesu.