Friend of a friend of a friend

Last night, TheWriter came over with six of her friends. They had been looking at Christmas lights and stopped by for hot chocolate and conversation. It was really fun having them over. TheWriter is a really cool girl. Way chill and way fun. Quite honestly though, TheWriter is just not for me. I am not attracted to her like that. So of course, she brings along a friend that I am very attracted to.

Swift is her friend. She teaches at an elementary school. She is much more quiet and calm than TheWriter. She is very pretty. She seems very intelligent but fun. There ought to be a way for me to just ask Swift out without having to worry about TheWriter. After all, I have only been out with TheWriter once, and last night was the second time we hung out. We aren't in a relationship. We haven't held hands, we haven't kissed, we haven't cuddled. There is an unspoken set of rules that say you can't date the friend of someone you have dated. By my interpretation, those rules apply to Swift because I took TheWriter out on one date. Is there a way to accomplish me taking Swift out without breaking the unspoken rules? If not, perhaps it is time that I stop following "the rules." They haven't exactly done much for me anyway. Why should I be prevented from dating friends, sisters, roommates, or cousins?