Percy gave a little jump when something landed on his lower back. When it turned out to be a hand, and Oliver's hand to be more precise, he gradually relaxed. He might have minded it there in a crowded corridor in the middle of the day, but they were outside, it was dark save for the moonlight, and the only one around was Verity.
She already knew what Oliver's hand was doing in a very intimate place.
"Hi Oliver," he said, completely oblivious to the look his boyfriend was giving Verity. Only when Verity seemed to perceive there was a problem did he add in, "Is something the matter?"