Eat the hiker's ass

You make sure Harold is watching, then slowly lean down, your tongue sliding over that dark, puckered opening. The hiker gasps, his body tensing beneath you, and Harold makes a soft, strangled sound. Your tongue soft and wet, you lick the hiker's hole, relishing the taste of sweat and musk, the way his entrance twitches, clenching and softening as you feast.

"Oh, fuck," he moans as you spread his cheeks wider and press your face between them, pushing your tongue against his anus, circling that ring of muscle until he surrenders with a hoarse shout. His quivering hole relaxes and you slide your tongue inside him. He moans as you jab your tongue as deep as it will go, but you find yourself disappointed in your equipment. Imagine the noises he'd make if it was just a bit longer, thicker, stronger...

You have some energy stored up from fucking your master, not enough to do anything significant, but improving your tongue wouldn't take much.