I did post a guide on auto returning of hearts in this thread.
Slowly look back if u want,
i'm too lazy to find it for u though.
Quite easy to make yourself one.
1) Just download Nox Emulator
2) Download Tsum Tsum on Nox
3) Run the macro recorder thing on Nox itself
4) Go to your front page of your Tsum Tsum (where u can send hearts etc)
5) Start macro recorder
6) Click Mailbox
7) Position ur mouse such that u don't have to move ur mouse, and u can constantly click the same position to "accept hearts" and press "ok".
8) Spam click for 1month, making sure that you're not on the page with "ok".
9) Press cancel, returning to the main heart sending page
10) Stop macro recorder
And you're done. Just run the macro recorder on the main page and leave overnight.
I remember i got post a better tutorial in this thread before, you just gotta dig around.