Not Another Twin Sister

Sunshine Daisy Curtis is the twin sister of Sodapop...or is she? Dally, Steve, Two-Bit, and Johnny can't stop drooling over her, but Darry, Soda, and Ponyboy, somehow, don't think that they have a sister! Can Sunshine Daisy convince her reluctant "brothers," or will she have to return to the International Institute of Mary Sues? Just for fun!