She was never uptight in her clothing but these days she doesn't even try and hide it. Before I use have to try and wait for an opportunity for her to... bend over in her nighty or come out the shower now she always has something on show. She caught me looking up her skirt once when we where eating at the dinner table but instead of doing anything she gave my devilish smile like the one i seen before. During this meal my girlfriend announced that shell be staying away for night for one of her. Mark resumed licking in circles and I grabbed his head. ‘Yes! Oh yes right there,’ I suddenly cried. ‘Oh god, baby, don’t stop!’ Mark kept his position and pace true, concentrating his efforts right at the sweet spot and bringing me to a second earth-shattering orgasm of the night. As soon as I started spasming in rapturous delight, he took his mouth away and shoved his rock hard cock into me. I moaned loudly, the sensation was so intense and amazing, I couldn’t help myself. Mark fucked me. "Put that back right away, you nasty thing."Now I was seriously curious about the contents of the locked box."What are you hiding from me, little sister? I thought we had no secrets from each other."She stood up on the bed and I looked up at her perfectly formed snatch only inches from my face with her head bobbing in agitation and her curls flying in different directions."I am not hiding anything from you, dearest, let me have the key from the top drawer and I will show you my private. I realised he was actually whipping me, but at the same time my pussy was contracting pleasurably around whatever it was he was pounding into me. I was so confused. The sting from the whip in stark contrast to the pleasure that radiated in my pussy. The whipping stopped and I could feel the warm wetness of his wet tongue trace over the heat that burned where the whip had landed. I was completely at his mercy and wanted to be used, but was too shy to ask for what I really wanted, his tongue.