I saw spoilers that they do.
Which makes sense, although the author seemed to imply at first that young guy he piced up might be a new love. Guess not.
Rogi is so obsessed with Akitora, it doesn' seem he'd want anyone else. And Akitora had his own obsession.
With Asami dead....it's only the crime boss thing in the way, I guess.
This is a whole nother fucked up world. We can't think like normal people.
I mean, Tats himself handles the sex coercion pretty calmly at the end and doesn't kill Rogi ( Rogi is pitiful). Akitora was a shit father. Rogi is a better father to Reika than Akitora to Tats.
So, I just let the rules be the rules of this insane criminal milieu where just about everyone was either not raised right, abused, raped, etc.
But Tats got his happy ending with his darling--who was incested and raped and impoverished.
Rogi will get his, I guess.
They suffer and suffer, but fate lets them end well in love (if not everything else)

Too bad they didn't end up together.