"Do you want me to?" he asked her. He looked at her, and his tongue slid out to wet his lower lip. He wasn't thinking about taking a nap, not really. But she was tired, she looked totally wiped out. She needed a nap, needed sleep, and probably needed to just be left alone to have her nap.
He smiled down at her, and made his decision. "No. I think you need some alone time. But I will tuck you in," he grinned. He pulled the sheets down on the opposite side of the bed from where she'd pulled herself up, and patted the mattress. Once he'd tucked her in, instead of pulling back, he leaned in and kissed her.
His eyes closed as his lips met hers. It may have seemed impulsive, but he'd been thinking about it for some time. He probably should have waited until she was awake, and not trying to fall asleep sitting up, but he saw the moment, and just...went for it.