So I have a really hot girlfriend. She's awesome and we get along great. She also has a very hot sister. Like very hot. She flirts with me sometimes and I can't help but feel very attracted to her. She's also attracted to me and at times she tries to compete with her sister for my attention when we're all together. She also tries to test me, for example, she'll playfully tease and say if I do something my girlfriend asks me to do, she'll think I'm "lame" or "gay". I deliberately pay her no attention in these situations, as if to let her know that i don't really care what she thinks of me. Still I have to admit I have the hots for her bad. Has any other guy been in a similar situation? If so, how did you deal with it?