sisterly love? is the 4th chapter of the Citrus manga. It was released on May 18th, 2013.
After Yuzu takes Mei's Grandfather to the hospital, he thanks her and says she's no longer expelled. Mei is thankful to Yuzu for helping her Grandfather, and expresses her decision to return home with Yuzu after Yuzu asks her to come back, saying she would even if Yuzu didn't ask. Yuzu's confusion about her feelings for Mei only grows, as she tries to be a good sister.