Suspicion and hope were fighting inside Severus' brain for dominance. Lily had always been a friend, but she also was a Gryffindor. She might not want Potter, Black and their friends around her, but that did not mean it would stay that way.
"Are you sure you don't?" Hope was obvious in his voice and he knew he was just setting himself up to be hurt more. Someone like Lily would never stay friends with someone like him. He should listen more to the pureblood Slytherins, they were strong and if he played his cards right they might not mind that he was a half-blood.