Two of the Blood is a two-man guild comprising of Soraya Dwin'urdrenn and her apprentice, Sariella Sunblossom. The guild itself is not IC, but simply serves as a visual indicator that the two characters are closely intwined as Master and Apprentice. Neither character will ever refer to the guild in an IC context.
As of yet, Guild Master Soraya has no plans to develop the guild into anything more, although it is a possibility that may be considered in the future as RP develops. Both Sora and Sari are quite happy without guild-invite spam, and their spacious guild bank to share.