>>101420Take this from an /a/utist who fucked up before. Was peeping on sister undressing cos I wanted to fuck her bad. Got caught, kicked out of my parent's place, and to this day she avoids me.
I got off lucky, parents didn't report me to the cops, and they've started talking to me again lately, just trying to put it behind them. Shit can go SO bad if you misjudge her feelings for you.
basically
>>101526 gets it. Even if your sis is a 10/10, it's really not worth it