Lily laughed as well, pushing at his shoulder when he teased her. Still, she knew he was teasing, even if he hadn't nodded to confirm it. Closing her eyes as he resumed the kiss, she tightened her arms around him to hold him close.
After a little more kissing, when her lips were starting to swell slightly from the repeated pressure, Lily broke the kiss slowly. While they'd been living together, sharing a bed, and engaging in any number of physical things, they had yet to actually have sex. Maybe, Lily thought, it was time. She cared for him a great deal, and she'd had time to mourn the idea of Severus' absence and begin to consider the idea of truly moving on.
Stroking his hair gently, she waited until she was sure he was looking at her before she spoke. "Do you want me, love?" She continued to brush her fingertips over his hair as she watched his face to study his reaction, to ensure he understood the question and all the implications that went along with it.
She was fairly certain she knew the answer, because she was the one stopping them when they started fooling around, but all the same, for something like this, she thought it best not to assume anything. If he wasn't ready, she'd respect that as he'd respected her lack of readiness prior to this moment.