Example of the mass ratio evolution with initial conditions of M_1, initial = 24 M_⊙, P_initial = 1.377 d, and q_initial = 0.8. Top panel: Mass ratio evolution of the system. The coloured lines show the new model, the grey line shows the FO mass ratio evolution. The dashed lines show the stellar radii normalized by the respective Roche lobe radii. Bottom panel: Mass transfer rate of the system of the new model (blue) and the FO model (grey). The dashed black line denotes the initial thermal mass transfer rate of the secondary.