What do you think about this...?

So, im 15, and a guy. My sister is 14. a few years ago we both discovered p*rn together, i was looking some stuff up, she came in and started watching too. Around this time, i started masturbating. So did she. sometimes, we would both be lying on the couch, secretly doing it. We both knew each other was doing it, but we never said it to each other. at one point my foot went between her leg, and she adjusted herself so that my foot was touching her crotch. she humped my foot a little, and moved so that my foot was rubbing her. A few nights later, we were just chillaxing on her bed (which we do a lot), when i realized my arm was near her waist. i tried to make it go a bit closer to her crotch, and she realized it too and tried to discreetly do it too. i almost felt it, when we got called down for dinner. the thought of touching her there turns me on, but NOT because shes my sister, mostly because its just a girl whose doing that! now, she "secretly" masturbates around me all the time, but always under a blanket or quilt or something. We never openly talked about it, or mentioned it at all. what do you think about me wishing that i actually saw or felt her naked? again, its not because she is my sister, it is only because shes a girl!! and please, no hater replies!!!!!! i dont want people writing "eewthat'ss your sister thats just wrong" or anything like that, thanks.