Skinny dippin'

She floats out with the mattress, letting the water hold her weight. The sun presses warm against her skin. At first she just lies still, letting the small waves rock her. Then her hand drifts down. She touches herself slowly at first, fingers tracing the line of her bikini bottoms before pushing them aside. Her legs part wider. The air feels different out here, open and bright, and every little sound carries. She strokes herself in steady circles, letting the pleasure build while the sea keeps swaying her. Each touch gets firmer, faster. Her breath catches. The mattress shifts under her as she moves her hips to meet her own hand. She keeps going until the edge takes her, sharp and sudden, her body arching against the thin vinyl before she sinks back, legs still trembling, water lapping at her skin.