I read this last year. The uke was a wealthy young man from a privileged family. I think his dad had his arrested. Anyhow he has a fling with a thug on the prison's rooftop and gets knocked up. Years latsr, they reunite. The semr never got over his fling. They have a son. The seme had a darker complexion.

I think it's this one: Counterattack Through Pregnancy