Ryan my sister's boy friend

My sister's boyfriend soon had us all swinging with him.

This all started two months ago I was dating a girl called Tammy we are both 18 and my twenty-year-old sister Wendy was dating a 22-year-old guy Ryan.
Tammy and I was naked on my bed kissing and getting ready to have sex. Tammy was stroking my cock, and I was rubbing her clit.
When we start hearing my sister and Ryan doing the same thing in her room. Sally was moaning with gasps of "yes oh god yes" from time to time.
They were being very noisy, and Tammy was getting turned on listening to them having sex. Tammy got on top of me guided my cock into her and started riding me. As we listened to more moaning. I didn't last as long as I hoped listening to my sister moaning sent me over the edge. I must admit there had been times when I have been alone in my bedroom and I have jerked off listening to her with a guy or even when she was using a sex toy.
After I had cum, I rolled over and fell asleep.
I was having a dream of watching Sally fuck herself with the 12-inch dildo she has in her bedside drawers. I snuck in her room and found it. I go in there sometimes when nobody else is home to lick it just to taste pussy. Sometimes she doesn't clean it after using it.
I woke up to more noises from my sister's room and I noticed I was alone. At first, I thought Tammy had gone home. I went to have a piss and as I walked past my sister's room the door was half wat open I looked in and saw Wendy, Ryan and Tammy. All naked and having sex together on Sally's bed. Ryan was fucking Tammy, while Sally was sitting on Tammy's face, Sally had cum in her pubes and at a guess Tammy was licking cum out of her pussy. As Ryan fucked Tammy I smiled to myself while I thought about Ryan's cock was now dipping in my cum. So, if he fucked my sister again my cum, could end up in Sally's cunt.
Ryan pushed his cock deep into Tammy and cum in her. Sally was sitting up with her eyes closed and I got a great view of her boobs.
I quickly had my piss and went back to bed Tammy slipped into my bed a little later. As I fell asleep, I was thinking about Ryan's cock in Tammy, and I had a dream where Sally got pregnant and had my baby.
I woke up the next morning with Tammy sucking on my cock. I looked down and watched her head bob up and down as she fucked her face on my cock until I cum in her mouth. Then we got up grabbed our clothes and went and had a shower together.
Not long after this I noticed Tammy was spending more time around Sally. At the dinner table she spent more time talking to Sally and Ryan than me,
At one point she asked me to pop over to the shop and get her a drink she wanted. When I came back, she had a smile on her face, and I swear she had cum in her hair just beside her mouth. Sally was holding back laughter. I pretended not to notice anything. I even kissed Tammy on the mouth and stuck my tongue in her mouth.
We went to my room and undressed each other. We sat on the bed and kissed for a while before I went down on her. Then we heard my sister and Ryan starting up again. Tammy got on me and guided my cock to her pussy. She rode me hard and fast. After I had cum, I lay there and sucked on Tammy's breasts on one nipple and then the other. After a while I could not keep my eyes open and I started to fall asleep. A moment later I felt Tammy climb off of me and cover me with a blanket. Then I heard the door open and close. I heard a squeal from Sally and Tammy tell her I was asleep.
That was enough for me I got out of bed and followed her. once again, my sister's bedroom door was not completely closed and I looked in. Sally was sitting on the edge of her bed. Ryan was standing up and Tammy was on her knees in front of him sucking his cock. His cock was just in my sister and now my girlfriend was sucking my sister juices off of his cock. That was hot.
She got up and he bent Tammy over and started fucking her from behind while Tammy and Sally French kissed.
After a while he pulled out Tammy got out of the way and Ryan shoved his cock back into Sally and fucked her. I watched his blow his load into my sister. Then Tammy and Sally kissed got on the bed and 69ed.
Ryan sat on the bed next to them I watched stroke his cock. I never realized how it was until I saw it in his hand. That thing had been in my sister and my girlfriend. Tammy rolled off of Sally and Ryan started fucking her again. While lay back and watched and finger fucked herself with four fingers.
I think they noticed me. But they didn't say anything. This went on for a few weeks. Until one night we sat around drinking they spiked my drink, and I was totally drunk before I knew. I am not a big drinker, so it didn't take much. Tammy helped me to my bedroom and undressed me. I kind of noticed Sally and Ryan had followed us. But I was not paying them any attention. Then I heard Ryans voice say suck Andrew's cock. Tammy just stood there helping me stand up Then I noticed Sally had dropped to her knees in front of me and was sucking my cock. This was too much for me and I lost my load in my sister's mouth. She stood up French kissed me with her mouth full of my cum. They put my desk chair next to the bed and sat me on it, Then Ryan and Tammy got on the bed and fucked in front of me. He pulled and they got me on my knees and stuck his cock in my mouth. I could taste Tammy's pussy on his cock then I felt his hot cum squirt into my mouth.
They got me onto my bed naked, and I had an erection. I felt a pussy slide onto my cock and opened my eyes to see Sally riding my cock. My own sister was fucking me.
The next morning, I woke up with a hang over and not quite sure what happened the night before.
But from then on, each night was park night, and things started to get kinky. Sally and Tammy introduced me to pegging. Once they started doing that, they let me fuck them up the arse. So, Ryan and I could sandwich them. They started with a small dildo and then bigger ones. Then one night I was going down on my sister and Ryan took me up the arse.