Title: Der Kuss meiner Schwester - Eine verbotene Liebe (engl: My Sister's Kiss - A Forbidden Love)
First Published: September 28, 1997
Based on a true story.
Blurb: Mattis is in love for the first time. Day and night, he only thinks of Mieke. And when she accidentially touches him, he shivers. There is nothing he wants more than to feel Mieke's body.
When Mattis secretly reads an entry in Mieke's diary one night, he discovers that she loves him, too. However, this love can never happen. Because Mattis and Mieke are twins.