Starting Off a Relationship with MarkTo Mark, Lexie was "forbidden fruit", because she was Meredith's little sister and a "fetus", due to their large age gap. That's how she got her nickname Little Grey. Lexie came up to Mark and told him that the other interns were trying to take...
Aside from this being slightly hard to believe (although at Grey Sloan Memorial Hospital, anything goes), it's also giving me flashbacks to the last time Meredith found out that she had a long lost sister. When Mark Sloan and Lexie Grey took their last breaths after ...