C124 Pseudogyne

"Good, not bad, not bad," Li Bing'er continued praising him, "Very good, very good. Keep your stomach shut and take more …"

"En, good, good. Next, raise your butt, raise your butt!" Li Bing'er spoke again.

Tang Fei was puzzled. What did it mean to raise his butt?

"It's just clamping your butt tight and pushing upwards." Li Bing'er seemed to have seen through Tang Fei's doubt