It's funny how life throws these curveballs at you, isn't it? Crushing on your sister's best friend feels like walking a tightrope—exciting but terrifying. I've been there, and the key is balancing honesty with respect for existing relationships. Start by figuring out if those butterflies are just fleeting or something deeper. Maybe test the waters with light, casual conversations to see if there's mutual interest, but avoid putting her in an awkward spot where she might feel torn between you and your sister.
If the vibe seems positive, consider confiding in your sister first. It might feel scary, but blindsiding her later could blow up way worse. Keep things low-key; grand gestures or dramatic confessions rarely end well in these tangled dynamics. And hey, if it doesn’t work out? At least you’ll dodge years of family dinners filled with silent tension.