There are a few, and probably a few more where it's not stated whether it's brought up In-Universe
There's also bits of other tropes coming into play, such as various forms of manipulation, lying, or the effects of the consent.
If you're manipulated, it's still a free choice, and it's clear the consent was given. The basis of the choice may have been false, but it generally doesn't remove the free choice aspect. It doesn't exclude it, but it's not this trope on its own.
Lying about what you give consent to is much the same. It may be that what you gave consent to isn't what you're actually subjected to. But that's still clear the consent is violated. It's doing something to someone that person isn't aware of, plain and simple.
Both of those often make the character who consented feel tricked, which doesn't make it questionable. It makes it invalid.
The effect of the consent, while it may be interesting, isn't part of the trope.