Fruitful Alliance is still bugged in the lastest patch, v2.1.0.0034.
1. Read her soul alive will make Fruitful Alliance failed immediately.
2. After the first coversiton with Ruasare, the only option in diaglog is "Read her soul", meaning you cannot report your successful action in Crookspur.
Therefore, Fruitful Alliance is stuck at the "Report to Ruasare..." step.
This problem can be avoided by choosing "Read her soul" in the very first conversation, which is initiated automatically when you enter the room.
Don't mention anything about ally or slavery before that. You should read her soul, complete the Painted Masks quest first, then start another conversation and mention the ally or slavery matter.