monthly requirement

Mistress has decided that i am to give her $40 each month.   She said she is going to use this money to buy me things, either toys or lingerie.  She did show me a ball crushing device the other day and today She talked about special panties tht She wished i owned.   so i have no idea what She will purchase.   She did talk about me suffering for Her when i am alone on cam, so it may be something that induces pain.  i really have no idea