[ His voice. It stokes that fire hotter, even as quiet and rough as they are, because it's from him, it's showing he's enjoying this. Enjoying her. She gradually catches on that his noises are-- stronger, more raw, when he presses in deep, so she presses up to meet him, squeezing as best she can. It has the double effect of feeling really fucking good, of course, but that's secondary.

The tentacles-- go ignored, actually, because by this point she's closed her eyes, focusing entirely on the physicality and noise of it all. So when Phel's wandering fingers pinch her nipples she jolts, involuntarily tensing around him and gripping his hips, and releases a high gasp. ]

Aph-- elios!