forbidden fruit
US /fɚˌbɪd.ən ˈfruːt/
UK /fɚˌbɪd.ən ˈfruːt/

1.
禁果
something desired or pleasurable that is not allowed or is illicit
:
•
The secret affair was their forbidden fruit.
那段秘密戀情是他們的禁果。
•
For some, staying up late feels like a kind of forbidden fruit.
對一些人來說,熬夜就像一種禁果。