Jog on fin
Presuming this is genuine (benefit of the doubt being given for the time being), I see no problem with this and if she's genuinely offering a threesome with her actual sister, who you know to be hot, I'd be in there like a shot.
I think the important thing to do is for the OP to post her link. As there are lots of people on here who would like a sisters threesome.But that is not going to happen.The Op will want to keep it discrete for some reason...
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+1Eagerly awaiting info