Tammy's web cam

It all started a few months ago when my girlfriend's mother was in a car accident and forced to give up work. Her husband had left her years ago and she was desperate for money.
So, one night I went around there to take Tammy out to dinner to cheer her up.
Her brother Simon answered the door, and I went to her bedroom. Only to find my girlfriend Tammy 18 and her sister Marcy 20 naked on the bed having sex in front of a web cam. Their mother was watching, and she sat in front of a computer telling her daughters what to do as people paid them in tips to do things.
I just stood there and watched them 69 on the bed hoping to get invited to join the action for a threesome. It never came.
After they had finished, they showered Tammy got dressed and we went out for dinner. She told me how bad things had got the bank for threating to foreclose on the mortgage, and they were going to lose the house. She also told me her mother wanted this to remain in house. That I could not join in because she was not willing to part with any of the money they were earning via the web cam.
So, after the meal we went back to my place she stayed the night. I went down on her thinking about her and her sister going down on each other. We French kissed all the time I was thinking about her tasting her own pussy on my lips. As I fucked her, I kept imagining Marcy was there with us.
Before she left, she showed me how to find the site of her web cam.
So, I logged on every time I knew they were online. I quickly saw they had a few sex toys they used on each other. Tammy told me they belonged to her mother. She had the collection before the car accident.
I am watching one night, and Simon was suddenly there naked, and I watched as Tammy sucked off her own brother. I know how good she is at cock sucking. When we first started dating, she sucked me off for two years before we ever fucked.
She showed a close up of cum in her mouth before swallowing it. She went and washed up while Marcy fucked herself with a dildo. I did not know I felt about her and her brother after that. On one hand it was her brother on the other hand she is my girlfriend. It was only a blow job, not like they were having real sex. This time. Later after Tammy had returned, Simon was back. This time Marcy sucked him off.
During my dates with Tammy, I started imagining fucking her doggie style while she sucked off Simon.
I started checking out the tips on the side of the page while they worked and the tips went up when Simon joined them. People were begging to let them watch Simon fuck his sister. I found myself putting in few coins to get him to fuck Marcy. Secretly I wanted to see Simon fuck Tammy in the arse. I was hoping she would me do it and if Simon did it first it would be like I pressured her into doing anything she didn't want to do.
As I watched I realized things were not going as planned when Tammy bent over and Simon fucked her pussy from behind. I started spending tips give her a facial. But I was out voted, and she ended up with a cream pie.
After Simon left Marcy went down on Tammy and ate her cream pie. An hour later he was back, and they did it again.
Just after this Tammy came clean and told me part of what they were doing. Their father had been abusive, he had come home early and found his wife in bed with another woman, he could not accept anyone being bi or gay, he bashed her and kicked her out of his house with the children, and this was their mother's way of getting back at him. Watching his own daughters have lesbian sex and sex with their own brother was designed to upset the good reverend. Yes, her father was a priest. Her mother was sending video and images of what his children were doing with each other.
For my 20th birthday Tammy brought Marcy to my place and we had the threesome I had been dreaming of. Well sort of.
It started out I was kissing both sisters as well all undressed. They took turns sucking my cock. They both lubed up their fingers and started poking my arse as they sucked my cock. When asked why they told me Simon likes it so we thought I would. They got me on my back and Marcy rode my cock while Tammy sat on my face.
After I shot my load in Marcy, we swapped around now Tammy was on her back Marcy sat on her face while I was face down in Tammy's pussy.
I was right on the end of the bed. Then I noticed Marcy had moved and now she was behind me with a strap-on dildo. Tammy had her legs wrapped around my neck and I could not move as Marcy slowly penetrated my arse with the dildo. The number of times I had seen Marcy bend Tammy over and fuck her with the strap-on I knew that Marcy knew what she was doing. I kept telling myself I should be grateful they remembered the lube.
Just after that they lubed up my cock and Tammy got on top and fucked her arse on my cock. Then Marcy sat on my face I had forgotten I had already cum in there.
I suddenly had two girlfriend most days they were having sex with each other and their brother while their mother yelled instructions to them. Some nights I would take them out to dinner and then home for a threesome without their mother or brother. This was their chance to do what they wanted to do. It was like playing a pornographic version of twister. Your left hand here, your mouth there and your right hand over there.
Things do take a kinky side with us sandwiching one sister or spit roasting. I got to fuck both sisters in the arse. Then there was time the two sisters were 69ing while I walked around them taking turns fucking one and then the other. Then the girls started sitting on my face after I fucked them giving cream pie in my face.