This story does not fit the series and cannon.
Lindsey and Stella are sisters. Foster sisters because Lindsey´s family took Stella in when she was a foster child.
August 1997
Stella is a detective with the CSI and Lindsey wants to become a CSI. They are sitting in a café and are talking about Lindsey´s wish. "Stella I really want to become CSI." "Lindsey I know that it is your wish but I feal uneasy with you working as a CSI." "Why Stella?" "Because you are my little sister and I want to protect you. Choose a safer job." "Stella please. I need you help with this." "But I do not want to find you in a bodybag someday." "I´ll do my best to prevent that." "Fine I´ll help you little sister." "Thank you Stella."
Lindsey lives with Stella and Mac. Mac and Stella have been married for two years. So in the evening when Mac comes home they talk about it with him. "Mac Lindsey wants to join the CSI." "I could arrange that Lindsey but only when you are ready." "Mac I am scared. I admit it but I feel safe knowing that my sister would be near around." "Lindsey but you would not always be working with me or Mac. But I am sure that that could be arranged. Right Mac?" "Yeah you could always work with me or Stella. But still Lindsey I think you should not rush it Lindsey." "I will not Mac. Please." "I will think about it.