Sounds like you're lonely and she's horny. Here's my bad advice stemming from dysfunctional relationships: If you start having sex with her on a regular basis it will probably evolve into a relationship eventually. First you'll both start to get jealous of thinking about the other with someone else, next people will begin to ask if you are going out (a question that can either be dodged, shrugged off in a "I guess so" sort of way, or answered "We just fuck" which might spur your friend to have to defend his sisters honor), and finally you will both have to make up your minds as to whether you want to settle down with the person or if you've crossed a line you never intended to and need to end the relationship asap.
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life is a sexually transmitted disease
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