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!!
 
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