Hearing Sebastian's low groans had Elle feeling unexpectedly motivated. She had just suddenly thought of doing this for him because she did not want him to be frustrated with her sudden pulling of the brakes. But it was true that she also wanted to do something for him, to return the same kind of pleasure for him if possible, like he had been doing for her.
It just came as a surprise to her that she found herself feeling excited the moment she heard him let out a pleasured groan. She had already learnt and had come to know the sounds of his groans when he was feeling good. And that was what she was hearing right now. She was quite sure of it and her heartbeat sped up as her excitement surged.
He was already pre-cumming the moment she touched him so his pre-cum was now spread across his entire length, thanks to her hand movement.