cupboard love
US /ˈkʌb.ərd ˌlʌv/
UK /ˈkʌb.ərd ˌlʌv/
1.
affection shown only to get something in return, especially food
:
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Her sudden affection for her aunt was just cupboard love, as she knew her aunt had cookies.
•
The cat only comes to me for cupboard love when it's hungry.