fornication incest乱伦
first incest then forsake始乱终弃
The love of commit incest is painful。
乱伦之恋是痛苦的。
参考来源 - 诗意的栖居——论汪曾祺小说的文化意蕴N-UNCOUNT（不可数名词） Incest is the crime of two members of the same family having sexual intercourse, such as a father and daughter, or a brother and sister. 乱伦
Oedipus, according to ancient Greek legend, killed his father and committed incest with his mother.
据古希腊传说，俄狄浦斯杀死了父亲并与母亲乱伦。