Glad you read the story even if you prefer an older Snape.
As for Teddy, he got sick and when Andromeda took him to the healer, the healer noticed something had changed. As for the transformations, Teddy will transform whenever fullmoon occurs, just like any other werewolf, but he will not begin to transform before his body has fully matured. Also, his transformations will not be as painful as Remus' as Teddy is a born werewolf. Did that answer your question? Or?