It's Almost Time To Say Goodbye Sequel to Natsu's Weakness

In Natsu's Weakness Lucy and Natsu slowly grow feelings for one another but in Its Almost Time To Say Goodbye, Lucy becomes sick. Porlyusica said that the sickness is extremely rare and can only be given from hereditary. Meaning this is the sickness Layla Heartfilia had when she died by it. Can Natsu and Lucy's love...