Sonic Underground and the Merhog Princess

It has been 3 years since the Sonic, Sonia, and Manic (aka Sonic underground) have been fighting and on the run from Robotnik. Their never ending quest to reunite with their mother and become the Council of Four in order to put an end to Robotnik's tyranny. However, the long fight for that dream, the royal triplets begin to lose faith that they'll ever reunited with their mother or win this war against Robotnik, most effected is Sonic. Then the Oracle appears before them after so long and tells the hedgehog siblings that the promise time is fast approaching. He then reveals to them that there is more to the prophecy than what was revealed years ago. For before they can reunite with their mother, they will first need to find the 7 legendary Chaos Emeralds. In order to find them they would need the help and guidance from princess Amelia Rose. She would help guide them to the emeralds and their mother. However the Underground aren't the only ones looking for her. Robotnik is also after her and the emeralds. When the hedgehogs find her they are shock and surprise as they find out princess Amelia, or Amy as likes to be called, is actually a merhog. As they journey together Sonic and Amy slowly started to grow close and begin to fall in love with one another. Will they be able to complete their quest? Will the royal triplets finally be reunited with their mother? Will Sonic and Amy be together when the fight ends? Or will Robotnik get the emeralds and destroy them all?