The Twins & their little sister - incest, non-con, fxf,mxf,mxfxf (LF FEMALES!)

So I had an idea early this morning whilst I was trying to get back to sleep. It is based around a group of 3 siblings; an older brother and sister (18-19 twins) and a younger sister (15-16). The older two are both slightly dominant and very smutty. They have been involved with each other for a couple of years without their family noticing but find that they are almost too similar to each other at times and need a more submissive, if unwilling participant. While their younger sister is far more innocent and reserved.

However, one day something happens that changes the twins' views of their younger sister*. They start to realise that she too has dirty thoughts and is actually quite attractive. They decide to start preparing her to be their submissive. Slowly at first with sexual references, then starting to force her into sexual acts, either just purely on her own with one of them watching, or with just one of them at a time.
*Note: As of yet, I haven't worked out exactly what this will be, but I do have some ideas (see below) in the hope that we can work out this detail together

I am looking for a female to play the younger sister, if you also want to play the female twin then that's cool

Ideas:•she is caught masturbating
•they find porn on her comp
•her sister reads one of her texts to her friends, realising she is talking about sex
•she is caught looking at one of them while they change/bathe



The parents of course are out of the picture. Names and descriptions can be discussed as can any other details, just drop me a PM to let me know you're interested