Even I can't believe how bizarre this story is. But it's true my sister loves my cock. And she doesn't even realize it.

I guess it all started a few months ago. A now ex gf of mine was a little artistic shall we say. She loved sculpting and moulding but most of all she loved sex. She had all sorts of wild kinks. I won't lie it was a lot of fun but she didn't really appreciate boundaries.

Well this girlfriend of mine convinced me that I had the most "aesthetically pleasing cock" she'd ever seen. Admittedly I knew I was a little stronger than average in size. But she waxed lyrical about my girth, length, the angle I rose at and shapeliness acorn head. She really had me believing I had the greatest cock on earth. It was quite the ego boost. Eventually she convinced me to make a mould of it.

I thought it was a bit of fun and no one would know. How was I to know her side hustle online sex toy store would explode? She had all sorts of wild ideas but her number one best seller was of course Mr Dickens.

Again, I was glad for her. And completely ok so long as no one knew it was me. Everything was great. However I totally underestimated how kinky my gf was.

Step forward in time to my kid sisters 20th birthday. I took her out for some dinner as a present. A little fancy dinner just the three of us in the city. Unbeknownst to me my girlfriend had a present of her own for her. She presented to her in the middle of the fancy restaurant, still in its box. I recognised it instantly. It was after all mine.

I did my best not to make a scene and pretend I hadn't seen anything as the girls shared a bit of a giggle. When home however I was furious and broke things off with my girlfriend.

She flatly refused however. She said I was being uptight and that I'd come around. She even suggested I'd thought about my sister already.

My ex sure was a crazy bitch. And before too long it wasn't too long before she started sending me text exchanges she had with my sister.

Wow!! This present is amazing.

OMG, I can barely fit in the tip.

It feels so real as well, how did you make it so realistic. I've used it three times a day for the past week. I still haven't gotten it all the way in.

That image of my sister getting ever deeper on my cock was profoundly confusing. I felt angry but with my gf gone I also felt strangely aroused. I begged my ex to stop texting me. She made one final ultimatum.

Come round to mine tonight or I'll tell your sister everything.

Hi all,

A hopefully fun idea I have about a crazy girlfriend and my sister. Totally happy for you to play either role. I'm confident of writing both parts remaining or sharing the third character.

Hope to hear any responses, feedback or talk about one of my other prompts.