Beverley was asleep with her head on my shoulder and one leg cocked possessively over my groin. I yawned and wondered where we were – we’d definitely gone with the flow the night before – but I was careful not to wake Beverley, not least because we were still doing that weird buoyancy thing and I wasn’t in a hurry to start sinking.Straight up was blue sky and the dark leafy ends of overhanging branches. If I twisted my head I could see the arches and piers of a bridge that we must have just passed under. Occasionally a vehicle crossed in a flash of metallic reflection and engine noise.My memories of the night before were already coming apart in my mind. I definitely remembered grabbing some serious air while going over a weir, Beverley’s legs locked around my waist, her hips grinding into mine, whooping as her dreadlocks whipped around our heads and we twisted like a dolphin in the moonlight before crashing back down into the drainage basin and slowly sank beneath the surface.