Breathe 582, I hope he and his friend aren't wanting to sexually take advantage of you. Many years ago, a former girlfriend of mine and her sister invited me and a friend to stay the night at the very last minute. The sister was married. My ex was only 17. I was 20. Me and my friend felt uneasy, made our excuses, and left. We were both Christians, but she later abandoned the faith.
She wasn't a genuine person. We were spiritually incompatible.