At the smirk, John's own returned, mirroring the other's. He reached out a hand, hopefully slowly enough not to be misconstrued, resting it just where human skin interlaced and became black flesh.
"Don't worry. If I did nab him, it would be for your favor. At the very least it's what I owe you after the meal the other day," the blond vampire chuckled, the fingers on Venom's skin flexing softly before they dropped away. It depended on the difficulty of capture, whether or not he expected another favor in return. But, for now, it was a decent thought. If John stumbled upon the sought spider, he'd certainly wrap the man up for his current companion without expecting repayment. It would be enough to know he was on this creature's good side.