The configuration sits at the Siblings–Friends axis (兄僕線), with the directly opposite Friends (僕役宮) read as part of the same axis. You Bi is one of the six classical auxiliary stars (輔星) that condition every chart configuration; it’s Yin Water in element, paired classically with Zuo Fu (左輔), and reads stably across day and night charts. The Siblings palace classically governs siblings / peers / business partners.
Classical phrasing for You Bi in this register: 右弼配輔 — ‘You Bi pairs with Zuo Fu; the two together complete the supporting pair’. The general practitioner reading: configurations needing diplomatic support, partnerships, customer-facing roles. Specifically in the Siblings palace, the auxiliary-star register of social capital interacts with the palace’s siblings / peers / business partners domain — supporting it (when the chart structure aligns) or testing it (when it doesn’t).
Textbook reading: siblings or close peers tend to play this register, with the chart-holder benefiting from peer-level help. You Bi as an auxiliary star tends to lift this configuration when the chart structure is sound; when killing stars share or oppose the palace, the lift can be partial. The reading shifts noticeably when the chart-holder enters a 10-year luck phase that re-activates the Siblings palace.
For the synthesis itself. Reading You Bi in the Siblings palace at practitioner level requires: (1) which Main Stars share the palace and which sit in the opposing Friends (僕役宮); (2) which other auxiliary or killing stars share the palace (especially the partner star, Zuo Fu (左輔)); (3) whether any of the Four Transformations (四化) activate the Main Stars in this palace for the chart-holder’s day stem; (4) day-vs-night chart distinction; (5) the active 10-year and annual luck cycles re-shaping the palace. This is the synthesis the Zi Wei Dou Shu Masterclass teaches in depth. To check whether this configuration applies to your specific chart, plot it free at the ZWDS calculator.