Transforming Thomas

4th year. Tom and Godric have teamed up against Dumbledore, but when Tom keeps tormenting Gryffindor's son, Sirius, Godric punishes him by deaging him to a 5 year old, forcing him to tell Sirius why he treated him horribly to get transformed back. Tom is unwilling to obey, but his shame about the truth might prevent him from getting what he wants- a family. SPANKING/ CP, FATHER/SON