Read Usa-bility Manga:
Usami-chan has always wanted a pair of rabbit ears, and she finally managed to have a pair grafted. Will Mikura-kun think she cute? But there just one problem... she suddenly become very "sensitive". For fans of Mimi Mix! - this is the same world, but it not yuri. Four chapters total. It the minimum possible ecchi, everything is off camera - maybe two milli-Toloverus.