Lily felt nothing but affection and admiration for Severus at that moment. He was handling things so well and not caving in to the pressure to stoop to Sirius's level, though he had more than enough reasons to. She took the arm he offered and glared at Sirius, then spoke to Remus.
"No, it's really not!" she snapped. "Well, not since he came along, anyway." She gestured at Sirius.
Lily felt bad for snapping at Remus, but she really didn't see why someone so nice would hang out with such awful people. "I'd love for you to take me back to the castle," she told Severus in a much sweeter tone, turning to walk that way with him.