Akiha indeed almost lost grip on one of Sion's arms when her girlfriend's body jerked. She barely managed to keep her held down and a rush of warmth ran through Akiha at the power of Sion's climax and the way she called out.

...she actually felt pretty damn proud of herself.

Leaning down, Akiha rest her cheek against Sion's while she gradually slowed her hips down.