Secular spin evolution of the EBLM J2025-45 binary stars as a function of time, starting with P₀ = 1.5 day and P₁ = 2.0 day. We show the obliquity (top), rotation period (middle), and precession frequency ratio (bottom). The primary and secondary spins are shown in blue and red, respectively. The left column shows the evolution under magnetic braking alone, while the right column also includes tidal effects for both stars.