I got out my cell phone and called his number. “Hi Mark, its Kate…Hey, I was wondering if you might want to have dinner with me and maybe we could go back to your place for a while…Sounds good, pick me up around five thirty… I am going downtown and won’t be back until around five…Carol will be home to let you in if I am late…No Bobby is helping his dad at the store…see yah.”

I borrowed Carol’s Jeep and drove downtown. I had to do some shopping for some essentials and I wanted to pick up a new swim suit. I also wanted to check in at Williams Custom Jewelry. Tony Williams has been creating custom jewelry in our town for over twenty years and I always liked to stop in and see what new designs he had come up with. I have a few of his pieces that always get compliments when I wear them. When I pulled up in front of his shop there was a sign in the window saying ‘Closed for family emergency. Will return in two days.’

Shit, I was planning on spending at least an hour browsing in Tony’s shop and chatting with him. I turned the Jeep around and headed back to the house. I pulled into the drive about quarter of four and Mark’s car was already here. He must have come over early to visit with his sister.

I walked up to the front door and let myself in. I walked into the living room and let out a gasp. Mark was sitting in the leather chair and Carol was on her knees in front of him. When he looked up he had that deer in the headlights look. He quickly stood up and knocked Carol over as he tried to stuff his cock back in his pants. Carol was still sprawled on the floor when she saw me and immediately let out a shriek.

Mark zipped up his pants and helped Carol up and asked, “Do you want me to stay?”

Carol shook her head and said, “No. You better go.”

Mark came over to me and said, “Please don’t do anything to hurt her or this family. It not her fault, it’s mine.” He walked past me and out the door. I guess I was on my own for dinner.

I walked toward Carol. I wanted to hug her and tell her it was alright and comfort her and at the same time scream at her for cheating on my brother.

Tears were running down Carol’s cheeks “I’m so sorry Kate, I’m so sorry you had to see that. Don’t tell Roger, please don’t tell him.”

“My god, Carol you were sucking your brothers cock right in my brother’s house. What were you thinking?”

“I’m sorry, but I can’t help myself.”

“What do you mean you can’t help yourself? How long has this been going on?”

Carol sat on the couch with her hands folded in her lap and her head bowed. Still sniffling she started to explain. I sat on the couch next to her. I did not have a lot of sympathy for her at the moment so I did not try to hold her or in any way comfort her.

Between wiping tears from her cheeks she told me, “Mark and I were having sex long before I started dating Roger and you dated Mark. It all started when we were in high school. Mark always looked after me and I love my big brother. When I was little and scared I would sneak into Mark’s room and sleep with him. Mom and Dad thought it was cute and always told Mark to ‘take care of your little sister.’ When I started high school Mom told me I was a big girl now and needed to stay in my room or come and wake her up if I was scared.

“I was not naive and understood why mom did not want me to cuddle with Mark anymore. But I didn’t want to give up the closeness and the feeling of being totally safe and protected next to him at night.

Every once in awhile, until I was a junior I would sneak in Mark’s room and just cuddle for an hour and then go back to my room. Then it was just a kiss when I crawled in to bed with him and one when I left. Then it was more kisses and then touching. Finally in my senior year we just did it. I know it was all my doing. Mark never came to my room. That’s one of the reasons sex with Mark was so easy for me. He never made any demands but was always there when I needed him. Not like the boys in high school that I dated.”

“The reason Mark and I were so comfortable having sex and being naked with you and Roger is that we thought you were lovers too. You two seemed so comfortable with each other. My god the four of us would skinny dip and have sex right next to each other. We saw how you teased Roger and he would tease you right in front of us. It was not until after I married Roger that I knew that what we thought about you two was not true. That’s when I told Mark that we had to stop and we did. You were off to college and Mark met Patty and when they got married I thought it was truly over. I had Roger and little Bobby, Mark had Patty and we were both very happy.

When Patty passed away Mark was really shaken. I would bring a casserole over to him every week and spend some time with him. About four weeks after the funeral Mark was a total wreck and I tried to comfort him and it just happened. We have been having sex at his place about once a week ever since. What I did today was very stupid.”

“It certainly was.”

“Kate what am I going to do? I can’t lose Roger and Bobby.”

“Is Bobby…?”

Carol quickly nodded and waved her hand and said, “Yes, yes he is Roger’s. You know he was born just over a year after we were married and I was not involved with Mark.”

“Okay, just double checking.”

“What are you going to do Kate?”

“I don’t know. Roger and Bobby would be devastated if they lost you. I know Roger loves you and Bobby more than anything in this world. I also know you love Roger.”

“With all my heart.”

“So why do you cheat on Roger?”

“Because I love my brother too.” Almost in a whisper, “Because the sex is great and it excites me to be a little bad.”

“That’s more than a little bad Carol. This affair with Mark has to stop now or I will have to tell Roger.”

“I will try.”

I practically shouted at Carol, “Try very hard.”

I got up, left the room, went up to my room and slammed the door. I paced the bedroom floor and tried to calm down. I pulled out my cell phone and called Mark. He picked up on the first ring. I gave him a piece of my mind and warned him that if I found out that this affair had not ended I would go straight to Roger and damn the consequences. Mark listened and did not say a word until I was finished with my rant.

All Mark said was, “I will make sure it never happens again.”

For some reason I trusted Mark to keep his word a lot more than I did Carol.

Then it dawned on me. Not only was she cheating, it was incest. For some reason that part did not bother me when I thought about it. I thought about my brother Roger and how we teased each other and how on more than a few occasions I came close to dropping to my knees and offer to suck his cock.

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