I need advice

I’m supposed to be staying at my gf’s dad’s house this weekend with her. Her sister will be there, too. Her sister is so hot. I need help trying to show her that I’m interested in her. My gf already gave me permission to try, but her and I both think I’ll be unlucky. Her sister is very shy. I need a way that’ll let her know I’m into her sexually while also keeping plausible deniability in case things go south. Even ideas of messaging her, etc. would be helpful. Help me seduce my gf’s sister!!
 
I’m supposed to be staying at my gf’s dad’s house this weekend with her. Her sister will be there, too. Her sister is so hot. I need help trying to show her that I’m interested in her. My gf already gave me permission to try, but her and I both think I’ll be unlucky. Her sister is very shy. I need a way that’ll let her know I’m into her sexually while also keeping plausible deniability in case things go south. Even ideas of messaging her, etc. would be helpful. Help me seduce my gf’s sister!!
I think you are playing with fire, at best you should be polite friendly maybe compliment her and if you have a chance to be alone with her spread the compliments to her looks, or body, but sisters will rarely cheat on their own sister especially at home, but it can happen, just tread lightly, let her make the move!
 
I think you are playing with fire, at best you should be polite friendly maybe compliment her and if you have a chance to be alone with her spread the compliments to her looks, or body, but sisters will rarely cheat on their own sister especially at home, but it can happen, just tread lightly, let her make the move!
Agreed. Her *sister*? Bad move.

If her sister knew the lifestyle and was in it, you might have had a chance.
 
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Everyone is giving you advice regarding the questionable nature of what you're doing - that's not helpful in answering your question. Here's my advice.

It most like will be a long-game. You have to plant a seed first. You have to make it obvious (as opposed to subtle) and matter-of-fact (non-emotional). For instance, maybe during just a casual convo, just matter-of-factly say "don't take this the wrong way (the plausible deniability part), but I find you so attractive". Just leave it at that. Don't even worry about her response - it's not about the response - it'll take her time to process anyway. If there's ANY chance she feels the same about you (taboo or not) that seed will germinate in her head and will lower her walls/defenses for phase 2, at a later time.
 
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