Answers!

1) If Alice has the Fuck Her Face kink, but has been bound by Bianca, can she still use that kink? Can Bianca choose not to allow it?

Yes, Fuck her Face works while bound. If Bianca eats Alice's Pussy, Alice can Fuck her Face. Bianca could stll avoid this by eating Alice's Ass instead.

2) Suppose Alice has both Perfect Pussy and Perfect Ass, and that Bianca has pins her and tongues her pussy. If Alice does not get free on her next turn, does Bianca have to go for Alice's ass? Or does it only become mandatory if Alice gets free and then gets pinned a second time?

Yes, Bianca has to tongue Alice's ass at her first opportunity. If Alice is still pinned on her next turn, Bianca has to tongue her ass.