Posting my guilt here will probably not expiate my sins but it's better than nothing. Briefly, I have visited my sister, Abby, for our entire adult lives where we separated residences. She married 20 years ago and when this issue began, Dennis, was 15 years old and his sister, Mandy, twelve years old. I'm an RN and Both of her children adore me. I have cared for both while sick. Unfortunately, they often pass their infections to each other, especially virus infections.

I have seen Dennis's cock both soft and hard and the first time I saw it hard I literally lost my breath. I asked Abby if Dennis's father is that big. She said, "No, but his grandfather is hung like giant horse." His grandfather is apparently also a bit of an exhibitionist with his proportions.

Not long ago, I woke up when Dennis began to slip under my blankets with me in my bed and I made believe I was still asleep. In minutes he had my panties off and entered my vagina. Faking awakening, I responded in a loud whisper, like, "Dennis, what the hell are you doing" as if I did not know. His cock was easily nine inches and with a cut foreskin so his large glans was proud and unrestricted. Before long I was soaked with my own lubrication and his giant piston made a slurping sound as it drove in and out of me.

I whispered, feebly, "Dennis you have to stop, this is wrong." He responded, "I can't help it, auntie Till." He was pumping into me from behind and it felt heavenly. Knowing his youth made it that more exciting. In just a few minutes I could feel his entire body vibrating like a leaf in a storm about to break free and I began to feel his steaming, pulsating sperm filling up my vagina.

I told my sister, Abby, what happened and she handed me a shocker. She said, "Just don't let him impregnate you. I have no reason to mind it, I've been fucking his grandfather so I know what that delicious cock size feels like. Dennis is now 17 and when I visit I allow him full access. We imitate secretiveness but I love it. I know his sister, Mandy is watching from somewhere when Dennis fucks me because I can hear her giggling. I've been wondering what I will do if she decides to slip under my covers with me one night. I am shocked by my own expectation. I also find my mind drifting toward their grandfather, my own sister's lover.

I have no idea how or if things like this take place in other homes but here we are. END of confession.