I'm a 16-year old boy, and my sister (17) is having a few girl friends spend the night tonight. My sister is pretty, and so are all of the girls spending the night. She's also a cheerleader, as are a couple of the girls. What's a good way for me to approach the girls and ask them to give me a back massage? I don't have a girlfriend. Can I offer to give each of them back rubs too? I kinda have the hots for all of them (her friends, that is).