Oh, dude, that's a sticky situation you got yourself into. Technically, being attracted to your girlfriend's sister is not illegal or anything, but it's definitely a one-way ticket to Relationshipville, population: you and a whole lot of drama. Like, maybe just focus on appreciating her sister's good genes from a safe distance, ya know?
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If you are attracted to your girlfriend's sister, you need to be very careful. You need to break up with your girlfriend because she finds out and they will both hate you.