I spent the best part of the next 2 weeks in turmoil, I knew what we had done was wrong and had to be kept a secret but I was also a very horny 16 year old who wanted a repeat performance more than anything else. My masturbation habits went into overdrive as I would constantly relive all the events in my head, I would compliment Sharon at any opportunity, on her hair, clothes, make up, looks, etc, hoping she would give in and relent to another session, but I always got the same response, thanks for the kind words but nothing else is going to happen.

All that changed on her 17th birthday, it was the day before Good Friday. It had started just like any other as a school day but as we were on  break for Easter it was only a half day at school. Sharon had got permission from my parents to skip school with Tina to go shopping as it was her birthday. Sharon was still in bed when I left for school with Helen my other sister, so left her card and present on the kitchen table. I came home from school at around lunch time, immediately got changed out of my uniform into T- shirt and shorts as  was off to play football with my friends. Both Phil and I lived in the same street, but at opposite ends

After playing the football for a couple hours the game disbanded as a couple of the guys had to deliver newspapers. So we all trotted off home. When I got home Sharon and Tina were both sitting on the sofa in the living room giggling about something or other, I had no idea where Helen was. I sat down on a chair opposite them and wished her happy birthday then made small talk about how her day went. After a few minutes Sharon got up to fetch some cold drinks from the kitchen, when Sharon was coming back, Tina said with a rather mischievous smile on her face, " aren’t you going to give her a birthday kiss then ?" , I replied OK then. Sharon said don’t I get a say in this. As Sharon neared me with 2 cans of soft drinks in her hand, I stood up and took a couple of steps towards her and stood in front of her blocking her way. I leaned in and gave her a peck on the on the cheek, Tina groaned and said, " that’s no good, give her a proper kiss like before ", I turned my head to look at Tina and winked, then turned to look Sharon straight in the eye, and for a few brief moments there was one of those scenes like you see in the movies or on TV but never think happen in real life as we gazed in to each other’s eyes and  I swear to this day that her eyes were just saying, " fuck me now !" I broke the gaze by moving my right hand to the back of her head and pulled her face towards me. We both tilted our faces as our lips locked, then parted lips as our tongues inter mingled. By now my cock was rock hard and I really didn’t care who knew. I moved my left hand  to her right butt cheek and pulled her body hard against me making sure she felt how hard my cock was, and began squeezing and rubbing her ass. I could feel the outline of her panties through her dress.  Then I started to pull the bottom part of the little black dress she was wearing up to a  point she pulled apart and broke the kiss. She then said “I have told you before nothing else is going to happen it was a one time thing, now either lose your hardon or have a wank,”   This time somehow, the way she said it I didn’t believe her and knew we would going to have sex again. Tina told her to stop teasing me and just fuck me if she was going to. Tina then said the least Sharon could do was show me the underwear she had bought. Sharon said nothing would happen between us but would show me the underwear and began to rummage in the shopping bags at her feet. She pulled out a matching set of a red satin bra and panties set on a hanger, quick as a flash I said very nice but for a proper opinion I would need to see them on her, to where Tina agreed and said Sharon should go and model them for me. Sharon said she wouldn’t as it would just be teasing me. This felt really strange but exciting to hear myself being talked about like this in my presence.

Tina then changed tactics and began to fire a series of rapid fire questions about our session together, like, was he big ? was he thick ? did it feel good inside her ? did it stretch her ? did she taste me ? did she taste my cum ? did I make her cum ?  As the questions kept coming you could see Sharon getting annoyed and then after the final question of,  if he was really that good, would you let him do it again ? To which she replied, Yes, she would do me again. Sharon knew she had been tricked and was annoyed she then stood up, picking up the shopping bags, turned to Tina and said if you really want to find out, do him yourself and walked out the room and upstairs.

I should point out that Tina was a few months older than Sharon and was wearing a tight white T-shirt through which you could clearly see the pattern of her bra, a denim mini skirt, ankle socks and tennis shoes. While she was asking those questions, I saw her thighs part and I could see the white triangle of her panties. My stiffie remained throughout and I made no attempt to hide it. I just looked at Tina smiled and said come on then. She stood up and walked over to me, dropped to her knees and placed her right hand on my thigh at the entrance to my shorts, before moving inside it and grabbing my cock through my opening, gave it a couple of tugs, before releasing it and saying let’s have a proper look and moving both hands to the waistband and tugging my shorts down, I raised my butt to help her, as she pulled both my shorts and my underwear down to my ankles. While still on her knees, Tina then took my cock in her right hand, stuck out her tongue and began to lick up and down the length of my swollen cock, paying particular attention to the head of my cock and swirling her tongue around the ridge before engulfing my entire cock in her mouth in one swift gulp. She then wrapped her lips tightly round the shaft, bobbed her head up and down several times before she looked up at me as she removed my saliva glisstening cock from her mouth and smiled. Keeping her head still and holding my cock with her left hand she started to stroke it into her mouth, all the time swirling her tongue around the head of my cock. She then proceeded to move her right hand underneath her skirt and between her legs. Her  position of her body was hiding what she was doing, but I could feel by the movements, she was fingering her pussy. After a few minutes of this, she moved her left hand to my balls and started fondling them before snaking her right hand between my legs and started circling my asshole with her middle finger before slipping it inside, wiggling it a couple of times and slipping in another one as well. She then started bobbing her head up and down my cock again. All these new sensations were driving me totally insane and I could feel the spunk start to well up in my ballsack and soon explode. It was shortly after feeling this awesome sensation, 2 huge volleys of sperm shot into her mouth followed by a couple of short spurts, which caught her by surprise, but she handled it like a pro, not letting a drop of jizz escape her sweet lips.

Tina  swallowed all I had to offer and licked her pretty lips and with a twinkle in her eye looked me straight in the eyes and said “mmmmm, very tasty and I'm sure, nutritious !"  She laughed,  grabbed the neck of my shirt, shuffled back a few feet on her knees and pulled me onto the floor with her. I put my hands on her waist as we locked lips, and as soon as my tongue entered her mouth I could taste the remnants of the creamy spunk still in her mouth. I surprised her by carrying on and not immediately withdrawing, she said later that it turned her on, but for now, my right hand moved on to her left tit. I remembered Sharon using her thumb to flick my nipple and the sensations it brought me so began to imitate what she had done, this made Tina breathing became faster and heavier. Tina let go of my T-shirt and cupped my balls with  her palm and fingers as this started to breathe some life back into the old boy. So with my tongue in her mouth and hand on her breast I gently pushed her on to her back. Once lying down I eased myself off her body and onto my elbow as I grabbed the outside of her left thigh and eased it apart so I was lying in between her legs. It then dawned on Tina that I intended to fuck her. She raised her left hand to my chest and suddenly said no, not here, if we are going to do it then upstairs and on the bed.

I got up and offered my hand to her and pulled her up. With my shorts and underwear still round my ankles I kicked them off before stooping down and picking them up and proceeded to walk upstairs side by side. About halfway up the stairs, Tina grabbed ahold of my cock. Then she stopped, turned to face me and kissed me dead on the lips. With my free hand I moved it in between Tina’s legs, I felt her part her thighs a little to give me access and soon encountered her panty clad pussy, this was the first time I had come into contact with hers, so wanted to saviour the moment. I remember I could feel her pubic hair coarsely rubbing against my palm through her panties, and also the warmth and dampness. As I rubbed back and forth the opening of her panties slipped in between her lower lips giving me open access to her pussy, instinctively I hooked first one then 2 fingers inside her and tried to imitate the movements of my cock inside her wet pussy. Tina put both hands on my shoulders to steady herself as my fingers thrust vigorously in and out of her pussy making her legs weak as I again felt the ripple of her muscles but this time against my fingers. What surprised me the most was how much more loudly and vocal Tina had been over Sharon. as I withdrew my fingers for the final time Tina took hold of my hand and sucked my fingers into her mouth, tasting her own juices  before taking my fingers and making me lick her juices off my fingers. If I close my eyes I can still taste her juices to this day. I just said to Tina, bed now, she smiled and followed me upstairs, as she passed the closed door to Sharon’s room she opened it popped her head round and said I’ll tell you in a bit if he’s any good.

As I entered my room I dropped my stuff on the floor and took my T shirt off , before jumping on the bed. Tina followed me into my room and stood a few feet away from me, looking at my naked body before unceremoniously stripping her clothes off, I let out a low wolf whistle as she stood naked at the side of the bed, and I muttered gorgeous, absolutely gorgeous. What struck me the most was how different her boobs were to Sharon’s, they were conical and pert with her nipples sticking out at different angles, while Sharon’s were round and full. Tina got onto the bed next to me and we laid down next to each other jostling for position before settling for Tina on her back and me on my side with my mouth wrapped around her left tit and my left hand snaking down to her pussy. I hadn’t been sucking her nipple very long before she demanded me to fuck her. I shuffled between her legs as she reached down and guided my cock into her. I soon found a rhythm and began banging into her but kept losing it as I was distracted by the old squeaking of the bed springs and also the banging of the headboard against the wall and the fact that Tina was very vocal with instructions. It was very hard to maintain a rhythm as she tried to match me thrust by thrust, so it becamevery akward due to her lack of experience. As it was very noisy and we soon attracted the attention of Sharon who entered my bedroom wearing her birthday present. She told us to keep the noise down in case anyone came home. Sharon  didn’t leave the room but stood in the doorway watching us. Tina reached out and grabbed Sharon’s arm and pulled her on to the bed as I managed to get out of the way just as Sharon came crashing down on top of Tina. I Got off the bed very disappointed as I was enjoying what was occurring with Tina. I looked over at them and Tina was on top of Sharon rubbing her back and undoing her bra and she was looking at me and gesturing at me with her head towards Sharon's butt. She did this a couple of times before it clicked that she wanted me to fuck Sharon, so as Sharon and Tina lay on the bed in a crisscross position with Sharon’s feet on the floor I shuffled behind Sharon and in a quick movement pulled her Birthday panties down around her thighs and rammed my hard cock  inside her in one swift motion, because she was that wet. Comparing the tightness and how different it felt from Tina's pussy, it was like night and day. We were quickly gaining a smooth rhythm of hard little jabs in and out. As Sharon started moaning Tina moved Sharon’s bra out of the way and started to knead her boobs. Sharon was really starting to moan and was saying things like fuck me, oh god fuck me, just do it, fuck me now. Etc. This went on for what seemed like ages as I was nowhere near coming Sharon’s moans getting louder and more vociferous as I really started to bang into her, she then laid still gripping the sheets with her fists as her muscles inside her pussy rippled up and down my cock, It felt so amazing ! Slowly I started to feel the familar sense of my sperm rising in my nutsack which I was glad as I was starting to get a little sore despite all the lubrication pouring out of Sharon’s pussy and my cock jerked twitched a few times before spurting out 2 long streams of spunk that splatted between Sharon's shoulder blades and 2 smaller shots that barely dribbled out. My orgasm was very intense even though the amount of spunk produced was pitiful as it was my seconf orgasm within the last hour. My cock starting to shrink as I withdrew from Sharon’s pussy with a loud popping sound and stood back quite proud of myself that there was 2 females willing to “play” with me, As I stood back saw Tina’s right hand suddenly appear at the opening of Sharon’s pussy lips, Tina used her fingers to part Sharon’s lips before inserting 3 fingers into Sharon’s pussy and proceed to finger fuck her, her became a blur of activity as it built another orgasm inside of Sharon. I was very interested in the technique Tina was using so I could learn from its was watching intently and making a lot of mental notes of where her fingers were placed the rhythm used etc. As Sharon’s orgasm subsided she turned her face to Tina and planted a big smacker on Tina’s lips. I was still standing up leaning against the wall just drinking in the sight of the 2 bodies before me.

They eventually sat up on the edge of the bed, it was Tina who spoke first, by saying thank you to both of us for an amazing experience. there followed quite a lengthy conversation mainly between Sharon and myself with Tina acting as a mediator. We both opened up quite a bit and it was decided that we could carry on doing things together but it would be when Sharon agreed and that I couldn’t do whatever I wanted to. Naturally, I agreed to whatever terms were being offered as I didn’t want this to ever end. I left the room to use the bathroom, when I re-entered the room Tina was fully dressed and Sharon put on some old clothes before taking a shower because she didn’t want to ruin the Birthday Undies. Tina got up to leave, but as she passed me she stopped turned to face me and leaned in to kiss me. Instantly we were exchanging tongues, as the kiss broke she cupped my naked balls with her fingers again and said we need some practice, then she turned to Sharon and said don’t wear it out I have some unfinished business with him. This made me very happy as I realized that there may be the chance of another encounter with Tina. Sharon said she would try and make some arrangements, and with that got up to let Tina out of the house.

The next few days being Easter weekend were taken up with family stuff and no opportunity arose but the "encounters", as Sharon called it, started in earnest the following week !