Failure To Thrive

It is post DH, and in the immediate aftermath, Harry experiences a spontaneous de-aging effect that sets him back physically, (& mentally?) by about 3 years. Recovery is challenging, and Harry is resisting help. But he does manage to get it from some unlikely sources. Follows DH, but AU (Alive!) Severus and Malfoys. Bonding/Mentor fic. Rating may change to M in later chapters