These show married life, but not necessary what happened before ;

Guys After Marriage (josei) , Ikioku - The Cooler Half (seinen) , Moyashi Fuufu (seinen) , Wife & Wife (yuri).

As for yaoi, maybe New York New York? But I haven't read it, so I can't be 100% sure.

I'm pretty sure that at the end of The Violinist of Hameln the male and female protagonists get married, and its sequel tells the story of their children.