it's not a setback, i wouldn't consider it as such. but if you did what your brain told you and give in to what it wants, like if you started fantasizing and masturbated while you are on the shower then I would consider it a relapse...
be strong recovery, like you said your brain is negotiating with you, it will make it look like a win-win situation, but trust me it's not...
all your brain wants is the dopamine kick from your relapse, it doesn't care if you relapse and watch porn. all it cares for is the dopamine, even if you lose yourself in the process...
stay strong recovery, don't get manipulated by whatever your brain is telling you, just hang in there and try to stay busy and observe your thoughts but don't act on them...
keep pushing my man