The story of Nashi Dragneel and Silva Fullbuster

Natsu and Lucy get married and have twins, Luke and Nashi. Gray and Juvia get married and have a daughter named Silvia. One day Nashi and Silvia get kidnapped by a new foe. Natsu and Lucy tried everything they could but with Lucy being pregnant it was too hard. They couldn't save their daughter. Gray was trying to deal with the loss of his one year old daughter and now the death of his wife. Gray only had Grayson, his son. 16 years later the girls return, however they are not there to reunite with their family but something much more sinister.