This is the 4th Chapter in a much longer story. For your maximum enjoyment it is suggested you read Weeks 01, 02 and 03 first.
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The next week I was forced to accept far more shifts at the supermarket than I wanted - I had tried to organise my work so that I would be on duty most evenings, leaving me free during the day to take advantage of being alone at home with Mary. Unfortunately it was not to be as there were quite a few full time staff off on their own annual leave and, as I was only a pro-tem worker, I had to take what they offered. So I reluctantly resigned myself to working three full days during the week as well as my usual shifts over the weekends.
I had told Mary the news over the weekend and she had smiled sympathetically. "We'll just have to make the most of what time we get" she said. "Let's try and make it very special." She was disappointed, I could tell, but I loved the way she took the positives out of the situation rather than moaning about what could not be helped. I loved her even more at that moment.
So Tuesday was my first day off work and I was woken in my bed after our parents had gone to work by Mary lifting my quilt and sliding in next to me. "Good morning lover" she giggled, "I thought I would join you for some pre-breakfast treats."
I rolled over onto my back and put my arm around her as she snuggled into me, planting little kisses around my neck and across my chest. She was wearing a very skimpy vest and shorts pyjama set which looked like it was at least one size too small for her - her breasts were stretching the fabric of the vest very tightly across them and her arse was literally spilling out of the shorts as they disappeared into the crack between her buttocks. Another souvenir from our shopping trip last week I guessed.
"Good morning my darling" I replied. "I wonder what treats you could have in mind!" I teased and smiled at her.
She moved her lips to mine but I hesitated - I had morning breath as I hadn't yet cleaned my teeth. Ignoring my hesitation she pushed her tongue into my mouth and sucked my bottom lip into her mouth. Mary's breath was sweet and fresh and I guessed she had been to the bathroom before coming up to my room.
I started to kiss her back, our tongues entwining and starting to battle each other; our saliva mixing and forming a warm wet pool of dribble that leaked from the sides of our mouths. I brought my hand up and cupped her massive breast, tweaking the tiny nipple through the fabric of the vest she wore. I could feel more than hear her humming gently at the back of her throat, enjoying the build up of excitement.
I gently broke the kiss and lowered my head to her breasts, pulling the front of the vest as far forward as I could so that her nipples sprang into view above the low-cut neckline. I caught her left nipple between my lips and began to suck as hard as I could. "Mmmm yes, that's good" she moaned.
The front of my bed shorts was growing very damp from the pre-cum that was leaking from my already rampant cock. I continued to suck hard on her breasts and then bit down hard on her nipple. "Uuuuh" she grunted. "Oooh yes, you know I love that. Oh Adam, that's soooo good."
She pushed my shoulders back and rolled herself on top of me, her thighs either side of mine and her torso propped up on her elbows and forearms. Her breasts were mashing tightly across my chest and I could feel her tiny, rock hard nipples grinding into me. We continued kissing passionately and I was running my hands down her back and over her arse cheeks, cupping them and pulling them apart as I massaged them. She was wiggling her groin and her pussy was rubbing over my erect cock, separated only by the material of our bed shorts.
I pulled on the waist of her vest and she raised herself slightly so that I could slip it up her body and over her head. She shucked it from her arms and tossed it aside. Now her breasts were naked against my chest and the heat from them was intense. As she kept wiggling her hips, her breasts were squirming around on my chest and the feeling was driving me mad with desire.
"Oh my," she said "you seem to be getting very wet down below!" She let out a sexy throaty chuckle and lowered her hand between us so that she could cup the base of my shaft and my balls in her palm. "Aaaah" I moaned and thrust forward my hips. She pushed down the waist band of my bed shorts and my prick sprang up, splattering my pre-cum into her palm. "Ooooh my, that IS wet and sticky" she giggled.
She was rubbing her palm over the head of my cock and coating it with pre-cum. She then brought her hand up to her mouth and licked the juices from it, repeating the process but then rolling her fingers across my mouth and between my lips. I flicked out my tongue and lapped at my own pre-cum, enjoying the salty, sticky, warm taste of it. She leaned her head forward again and started to kiss me very hard and we both enjoyed the taste of my pre-cum mixing with our saliva.
Releasing my lips from hers Mary started to move down my body, covering every part she came to with little licks, nips and kisses. She stopped for a while at my nipples and licked and sucked on them and bit them quite hard. I gasped and moaned as she did so. "Do you like that too?" she asked. "Is that as good for you as it is for me?" I panted out my agreement, almost too aroused for words.
She arrived at my stomach and her amazing tits were pressing hard on my swollen prick and my pre-cum was smearing across those gorgeous globes. Lifting herself up slightly she squeezed her tits together by wrapping one arm around and under them and pulling them together, making a deep, deep valley between. With her other hand she continued to rub the swollen gland at the top of my shaft and covering her palm and fingers with sticky pre-cum, which she smeared into her valley. She then took my cock and pressed it between her soft, warm, fleshy tits and started to tit-fuck me, using my own pre-cum as lubrication.
It was an amazing feeling. "Mary, Mary - that is just sooo good" I panted. "Oh Mary..." I was moaning with pleasure, the warmth from those soft tits was so exciting and the feeling of fucking her between them was leaving me breathless.
"Come on baby" she whispered. "Come for me. Come for Mary. Come all over my tits. Come for your sister, all over your sister. I want you to come" she was repeating over and over.
I could not hold back and my spunk was preparing to drive up my shaft. "Oh, oh, oh. Mary, I'm cooooming" I gasped. And suddenly I released my sticky load, shooting out between her tits and splashing all over her chin, over her chest and smearing over my belly and chest. I kept pumping an extraordinary amount of warm sperm, until eventually I was drained.
"Oooh" Mary laughed. "I think my baby needed that!" She sat up and raised her hand to her chin and wiped off the big globules of spunk that clung there. Once she had it all over her fingers and in her hand she brought it to her lips and started licking it until her hand was clean. "Mmmm" she said. "So nice."
She then rubbed her hands over her tits, collecting as much spunk as possible. She again brought one hand to her own mouth and started to lick her fingers clean. She offered the other hand to me and without hesitation I opened my lips and sucked her fingers in, licking and lapping on my own spunk until there was none left. Mary leant forward and kissed me deeply, with our tongues sharing the remains of any spunk left in our mouths.
She raised herself and settled down next to me and snuggled up. We lay there for ages, drifting into and out of sleep. Both of us contented and enjoying being together.
I could hear my radio playing in the background and suddenly became aware of the song that was playing - it was the Drifters song that did well in the charts a couple of years before and went: "like sister and brother we'll wave to each other... we don't want all the world to know we are really lovers." I smiled at the relevance - they may not have meant it, but that song summed up what was happening between Mary and me. I couldn't believe that in only a few weeks my sister and I had not just become lovers but had fallen deeply in love.
I felt Mary rouse herself, becoming wide awake. She started to kiss my chest and nibble at my neck and lick around my ear. The feeling was so intense that I became aroused almost immediately. "Hey you" she joked. "You owe me one, I have needs too you know!"
I smiled at her and pulled her over on top off me and kissed her again very deeply. I could feel her juices start leaking from between her pussy lips almost immediately. God she produced so much lovely pussy juice - I just loved it. "Is that so?" I said. "We'll have to do something about that, won't we?"
We kissed deeply for several minutes and she was gyrating her hips across my shaft, her pussy mound bringing me instantly to full erection and my pre-cum again starting to coat her stomach. She levered herself up so that she sat astride my groin and I could feel my prick sliding along her pussy lips. She reached down and pushed at the head of my cock until it was positioned right at her pussy entrance and then she slowly lowered herself down, impaling herself upon my turgid cock.
She drove slowly downwards until I bottomed out inside her. I could feel the neck of her womb rubbing against the head of my glans. She held herself up on her arms and her tits hung down above me - still amazingly holding their shape despite the pull of gravity on her beautiful large melons. As Mary started pumping up and down her tits were swinging back and forth. I reached up and grabbed them, massaging the firm flesh and pinching on her nipples.