Cassie didn't know what she and Charles were doing, but in moments like this one it never seemed to matter. Everything about this felt as easy as breathing. Now, 8 months into whatever it was that this was, it was hard to imagine she'd ever thought of him only as a friend, a brother, an extension of her friendship with Chris in some ways. It was equally impossible to remember all the reasons she gave herself in her more rational moments for why it shouldn't be happening.
No matter how caught up Cassie was in what she and Charles were doing, the sound of Chris' voice was like a bucked of cold water being dumped on top of her. She pulled sharply away from Charles and a hot blush colored her face.
"Chris, I-" What was she supposed to say. She could read the look on his face perfectly, but she didn't know how to explain something she didn't quite understand herself, so she scrambled for her shirt and hoped Charles had something more intelligent to say in the meantime.