Arya lay on the hard grass, her head resting uncomfortably on Gendry's ankles. She could hear the quiet snores echoing in his chest as his breathing became softer, he always knew when she was awake. They were 6 days from the wall still and it had become harder for her to hide that she was a girl; Yoren had come up with inventive ways to hide her small swelling breasts and her now proceeding hips.
She lay there for a moment thinking about her acquiring these traits. Her breasts tiny and binded to her chest with cloth but still she noticed Gendry staring. He was different around her now, if only slightly; he couldn't meet her eyes anymore and his touch always lingered. She remembered the night vividly, she had woken in her slumber to find Gendry touching himself -down there- and saying her name. She didn't know what to do so she ignored him and pretended to be asleep; her cheeks burned for days later.
She heard a harsh intake of breath and opened her eyes to find Gendry staring at her- no not at her but at her legs. She glanced down and saw the grass freshly sewn with scarlet. She took a moment to think about it before she panicked and jumped up. Oh shit, her moon blood had arrived.