I heard Jake asking his brother to please buy him and a couple of his friends some booze for tonight and that they promised to be of no problem. When ... came in the door the conversation stopped, or at least dropped down to a lower level of speech and I could only make out bits and pieces of Jake begging his brother to do this tiny favor for him, and that Jake promised he would get one of his friends to take care of Sam. Or at least thats what it sounded like waht was going on. I told them both. That got an immediate moan and her tongue swirling madly in my mouth.Now, with my hand up under her panties rubbing on her bare ass, I began pushing her panties down some on each downward sweep of my hand and, before long, her panties were down under her butt cheeks exposing her ass to my caresses.It was obvious to me that she really liked having her bare butt rubbed, something I've also found in later liaisons, and after a while, I rolled her over onto her back and brought my right knee up. Two simple words. Spoken clearly and with authority as an instruction, but carrying underlying layers of tension, lust and need. “Don’t stop”. I resume my strokes. Long and firm. Squeezing and gripping. I stare into her eyes, now dark with longing. Her mouth is open and she is gasping for each breath, sucking in irregular gulps of air, her wrist a blur. And suddenly, I notice, so is mine. My embarrassment has quickly given way to extreme and urgent arousal. Back and forth, SO hard. She is. My mum had taken her bikini top off to sunbathe, so I did the same, hoping to get rid of the tan-lines round my breasts. It was nice to be down on the beach relaxing, and I even had a little nap in the sun.We saw Sally and Abi again at dinner, and Abi thanked my parents profusely for looking after Sally, and bought them a bottle of wine as a thank-you. Abi caught my eye and smiled conspiratorially at me, as well she might.After dinner, I went for my usual postprandial stroll along the cliffs..