Betrayal

Harry comes back after the Second Wizarding War with an unpleasant surprise for Ginny...and she reacts accordingly.

Harry and Hermione marry...and both Ron and Ginny, albeit MOST reluctantly, attend them--but can't stick around once it's over and the pair are gone on their honeymoon.

It is five months later and Harry informs those at the Burrow that Hermione has given birth to a son. Ginny accompanies her parents, and there is a fateful encounter between her and Harry.

Hermione confronts Ginny about her liaison with Harry, and they discuss the situation.

Ginny discovers that she's pregnant and meets with Harry to decide what to do.

Ginny discovers that she is carrying a daughter; she discovers Harry visiting at the Burrow upon her return home and they discuss what happened at her Healer's...among other things.

Harry and Hermione sit down and decide what to do next regarding their marriage; shortly thereafter he discusses it, along with their options, with Ginny

Harry meets with Ron to tell him of his plans for Ginny after making arrangements for the care and custody of his child.

Hermione helps set up a new room for Ginny at the Burrow once the latter's pregnancy advances enough so that she cannot go up and down stairs anymore. Harry is told and gives his opinion of it prior to some quality time with Ginny.

Harry deals with Ginny's increasing pregnancy and the resulting moods. He eventually decides to have a house built, going under an assumed name to maintain his and his loved ones' privacy.

Harry keeps Ginny and the others informed as to the progress of the building of the new home, and wedding plans are finalised. Shortly thereafter, their child is born and the new parents react predictably.

Conclusion. The new parents take their child home, then Harry's first-born is brought to visit. Hermione even announces that she and Ron are to be married--and by the time it happens, the children have not only very satisfactorily bonded with their step-parents, Harry and Ginny have moved into their new house...and all have moved on to new lives.