Does Flurry of Blows stack with two-weapon-fighting?

[The Morphling]

Specifically, if you're using a quarterstaff as a double weapon, can you get a third attack by using Flurry of Blows (for another -2)?

[Branding Opportunity]

Nope. Flurry of blows is already a full-attack action. Since two-weapon fighting is also a full-attack action, you would have to be able to pull off two full-attack actions in a single round, which is impossible as far as I know.

[Mojorat]

The key thing is flurry of blows is as if using the two weapon fighting feat. Flurry is a full attack action. Twf normally modifies a faa. But as mentioned earlier your allready using Ted when you flurry and it doesn't stack with itself.