What was the 'strange kind' of service Mavshibai was performing, and how did Baba react to it?

Mavshibai's service, described as being of a "strange kind" in Chapter 24, involved vigorously pressing and massaging Sai Baba's stomach. The text uses vivid imagery, stating she was "twisting with both hands" and began "grinding" his stomach. It further describes the action as pressing and churning "like a pot of buttermilk," which made Baba's stomach and back flat and caused him to move up and down. Despite the intensity of this service, which caused pity in Anna's heart, Baba's reaction was one of complete ease. The narrative states that Baba "did not even say 'hay' or 'hooy'" and seemed completely comfortable, indicating he accepted this extraordinary service as an expression of her pure love and devotion.