My girlfriend's secret

How i found out my girlfriend fucked her brother and got me excited to fuck my sister

When I was 25 I was with my son's mother she was 19 and we had a one bedroom apartment it wasn't much but it was ours.
We where watching TV one day when there was a knock at the door when I answered I was completely surprised it was my beautiful blonde little sister I had not seen her for five years and man had she blossomed.
It turns out she was needing a place to stay and after talking it over with steph we decided she could stay on our couch.
This went on for three months just fine then I started noticing steph and Sara hanging out more and whispering finally I had to know what they were up to and confronted my girlfriend one day after work while Sara was gone.
At first she said it was nothing but I kept asking and she finally told me that Sara had asked her about our sex life and how good I was in bed she told her that it was impossible for her not to hear us fucking and it had Sara wondering about me and how big I was because of steph's screaming
That made steph confess to my sister that she had actually had sex with her brother one night while she was drinking steph told Sara that it was the most exciting sex she had experienced. Stephanie went on to tell Sara that she cum as soon as Ronnie pushed his dick all the way inside of her and that they had skipped school and fucked all day.
This got me excited and wondering what her and Sara where whispering about steph told me that after hearing about steph and Ronnie Sara was asking more questions about me so Stephanie ask my little blonde teenage sister if she would like to get fucked by her big brother and Sara's instant response was fuck yes.
This sent my head spinning hearing that my sister said fuck yes to being asked if she wanted me to fuck her and yes my sister is fucking hot and until that moment I had never thought about anything like that with her.
But for the next few days that's all I wanted was to peal her clothes off and fuck her like I have never fucked anyone before.
So after three days I told my girlfriend I wanted to fuck Sara steph just smiled and pulled me into the bedroom and we fucked for two hours harder than at any point of our relationship after she told me that she knew I was thinking of my sister and was okay because my dick was like steal.
That evening she told me she was going to tell Sara that I wanted to fuck her also I was reluctant but told her okay, that whole evening Sara smiled all around the apparent.
The next morning steph told me she was going to stay with her sister so me and my sister could fuck. That's when she revealed the rest of her plans.
Steph was going to have her brother Ronnie bring her home from her sister's house and wanted to walk in on me and Sara fucking that is her and Ronnie walk in she wanted to get fucked by her big brother as well the thought of that excited me.
To be fucking Sara while steph was getting fucked by her brother so I told her it's on.
That evening when I got home from work Sara ask where steph was I told her she was staying with her sister and would be back late tomorrow Sara's reaction to hearing this looked to be excitement and fear so I quickly jumped in the shower to clean work off of myself I didn't take any clothes with me just a towel as I came out of the bathroom Sara must have been getting worked up because she had on the shortest skirt and a half shirt that I dreamed about taking off her.
As I walked through the living room I grabbed my beautiful little sister by one hand and pulled her into our fist of many passionate kisses immediately she kissed me back as I pulled her into mine and Stephanie's bed my towel fell off and Sara was greeted to her first glimpse of her big brother's 8 inch dick and she had it hard.
As I was removing her clothes like I dreamed about I could not really believe just how perfect she was nice c cup brest a perfectly shaved pussy so I didn't miss anything.
We where kissing as I lay her down on the bed I broke away so I could suck on her perfect tits and as I made my way to her pussy I was in heaven knowing that I was getting ready to make love to someone who loves me as much as I love her. Finally my mouth was there I could smell just how aroused she was as my tongue touched her clit she let out the most satisfying moan I had ever heard.
Her taste was better than anything I had ever experienced I couldn't bring myself away from that intoxicating sweet spot between my teenage sister's thighs I stayed there until she was squirming trying to get away at this point she was begging me to fuck her.
I didn't let her down I was just as ready as she was,as I positioned myself at the entrance to my heaven my little sister panting as she was told me how much she loves me. At that moment I pushed all eight inches of my rock hard dick inside of Sara, I don't mind saying I came inside of her instantly and from the way she was twitching she was doing the same.
I didn't stop my dick was in my sister and it never went soft I was so excited and in disbelief that I was actually having sex with Sara that I didn't know how many times I had cum but she was leaking my cum out of her when she got on top of me.
We had sex in every position I know of in every room of the apartment.
And when my girlfriend Stephanie returned the next afternoon with her brother in tow they walked in on me fucking my blonde haired sister doggy style and as I pulled out to greet her my sperm was once again leaking out of my sister's pussy.
Both steph and Ronnie pointed this out!!