The weekend Cabin 2

I find out why my sister and her boyfriend broke up.

Since last weekend I was a little nervous about being alone with my sister Tammy. We started going for walks to burn up excess energy. We walked through a park with automated toilets, and she drag me into it and suck me off.
On one of these walks this girl ran up to Tammy they had their arms around each other and started kissing. It started on cheeks then their lips and then their tongues in each other's mouths. This went on for several minutes with Tammy's hands moving up and down the girls back giving her bottom a squeeze. While one of the girls' hands got between them and was under Tammy's skirt rubbing her pussy. After they had finished Tammy introduced me to Molly, Peter's little sister.
Molly stuck her hand out for me to shake I noticed it was covered in my sister's pussy cream. The three of us continued the walk until we came to a local park with the automated toilet both girls went in together while I stood outside and listened to the moaning coming from them. There was only two years difference in their ages. But I could hear my sister had a deeper moan and Molly was a little high pitched. They came with Pussy goo smeared on their faces.
That weekend Tammy wanted to go back to the cabin just for the day. Go up the Saturday morning and come home that night. She even put in for petrol. I knew she was up to something but had no idea what.
Just after we left home, we found Molly waiting on the side of the road for us.
While I drove Molly and Tammy were both in the back seat. I saw Molly had Tammy's tits out and she was sucking on her nipples.
The three of us arrived at the cabin. The only thing that needed unloading was the food. Which I did while Tammy showed Molly around the cabin.
I had just finished putting away everything that needed to be refrigerated when I decided to see where Tammy and Moly were. The cabin was not that big. one floor, four bedrooms, two toilets, two bathrooms, laundry and one big kitchen, dining room and lounge combined.
They were both naked in Tammy's room. Tammy was going down on Molly. I looked at the two naked girls my sister had B- cup breasts a nice size and firm. Molly had a bigger cup but smaller boobs. I found her bra later and they were D-cup.
When Molly saw me, she waved me over. I don't know what I was thinking all I can say in my defense I had seen too many pornos and I quickly undressed and got on the bed with Molly.
Tammy became aware I was there and she got beside Molly and started to teach her about sucking a cock. They both took turns. When I was ready to cum, I held on until Molly was sucking my cock and shot my load. Some of it was in her mouth the rest all over her face Tammy licked it off and then kissed her.
I then went down on Molly while Tammy sat on her face.
After that Tammy got me to lay on my back. They both sucked my cock until I was hard and then Tammy helped Molly climb onto my cock. Tammy lay on the bed next to us as Molly rode my cock. She was tight and felt wonderful on my cock. When she got off of me, I saw some blood and realized I had just popped a virgin.
Tammy took Molly to the bathroom and helped her clean herself up. Then we had lunch, the three of us sat around naked while we ate our food. Some of Tammy's sandwich came out and fell onto her boob. Molly leaned in and licked it off. Then they started kissing again.
Then Molly got up came over to me sat on my lap put her arms around my neck and started kissing me. Her tongue probed my mouth and mine was in hers. She got up and led me to the bedroom. Once there I went down on her again. The back of my mind kept telling me, my cum was in there a little while ago. My response was shut up. I then got on her and fucked her hard and fast. After I shot my load in her Tammy went down on her and ate my cum from her pussy.
I left them at it and cleaned up the kitchen dining room. Packed everything back in the car. Then I went and told them we needed to go home. I watched them both get dressed.

After Molly went home Tammy told me she was still trying to make Peter suffer. She was hoping I had just got Molly pregnant.
I looked at Tammy and said "I thought you liked Molly? Now you want to use her to get even with Peter."
She looked defeated and admitted she didn't know what she wanted. I hugged her and gave her a kiss on the lips.