Angry [Q] Teather + Reverse Teather?

I have a really weird problem I am trying to solve. (Hopefully this makes sense)
I have an app on 2 different android phone and Fiddler on PC (android can connect to it through HTTP Proxy).
How can I have the two phones internet traffic (of at least that one app) run through fiddler BUT without access to a WIFI internet connecftion (using mobile data only). One phone can tether and is rooted.

And for bonus points... having all that happen behind TOR proxy.

Any input guys? Thanks!