Couldn't resist my younger sister's husband's dick ⇐ Incest

[Anonymous]

I didn’t know which section to write in and decided that brother and sister was suitable.
Something happened to me and I don’t know what to do. Just some kind of cloudiness. I feel embarrassed and ashamed at the same time.
I am 40 years old, my sister is 28 and her husband is the same. We live temporarily in the same parental home. I am divorced and have 2 children.
I woke up this morning and there was no one at home. I went into the shower and then came out naked. I went to the room where my sister and her husband were sleeping to get some face cream. Already leaving the room, I saw that her husband was sleeping. I wanted to run out because I was naked, but I realized that he was sleeping. Already calmly walking through the room, I saw the tip of his penis from under the sheet and something stopped me. I don’t know what came over me, I’ve never noticed anything like this before. But I wanted to look at his penis. I carefully pulled the sheet aside, afraid to wake him. His penis appeared in front of me, it was standing, but the head was closed. I was overcome by the wildest excitement from this situation, I instantly got wet and I really wanted to cum. I looked at the penis and gently warmed myself between my legs. Not long, maybe half a minute. And then a new wave of obsession washed over me. I don’t know why, but I wanted to take this dick and open the head. I was incredibly scared, my heart was pounding as it seemed to the whole house. I decided to open his head. It was very scary that he would wake up, even though I knew that you couldn’t wake him up with a gun. In general, I decided and lifted his penis with two fingers and did not move for 5 seconds, but I felt that I was shaking all over like the first time. Very slowly and smoothly, I pulled the skin and the head came out. Again, I don’t know why, but I put my face against the dick and smelled it. When I heard the smell, my head just blew away, I didn’t understand what was wrong with me, my pussy was really burning and I felt it dripping onto my thighs. By some miracle, I realized that this couldn’t be done and tried to pull the skin back onto the head, but it wrapped up and didn’t work, and then, without expecting anything from myself, I took the head into my mouth and took it out once and immediately, but slobbered well. She closed her head and quietly left.
The same person in the other room, I stopped, put my hand between my legs and began to masturbate myself wildly. In about 5 seconds I came very violently, and there was such an orgasm that I almost fell. The entire pussy and crotch along with the thighs were covered in discharge. I came to my senses, quietly looked into the room and made sure that he was sleeping in the same way and in the same position. It's good that I didn't notice anything. I went and washed myself and I’m still sitting and thinking about this situation.
I am very ashamed that I did this to my sister and generally acted like I was sick. Her husband's dick was in my video, my drool is now abundantly smeared on his dick. How so? How could I betray my sister, how could I do this to her? This is her dick, and I pulled it into my mouth, smelled it, touched it, and even jerked myself off after that.
No one seems to know, but I feel disgusted in my soul and at the same time that I can still smell this dick and instantly flowing Should I confess to my sister or not? What to do. The mess in my brain is unreal.