This story is a sequel to Proud Mother of a... Changeling?

After Twilight receives a letter saying that Queen Chrysalis is the guest of honor in the Crystal Empire's First Grand Banquet, she becomes suspicious and attends in order to thwart any plans the changelings may be hatching.

Cadence and Shining Armor visit one of their generals and his wife in the hospital to give their congratulations on the new born foal. However... the visit wasn't as routine as they first thought.

Based off ScopeEva's prompt/idea during a discussion. Told ya I'd put it on my to-do list.