The unthinkable
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Fucking a girl in the ass when she has to take a [big shit]. Regular anal sex does not [qualify] as The Unthinkable. The big shit [requirement] is non-negotiable.
The unthinkable meaning & definition 1 of The unthinkable.
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so shocking that it cannot be imagined as possible:
The unthinkable meaning & definition 2 of The unthinkable.