Several ideas and images came to her mind as he suggested a few other places for them to have fun on. Attached to them was a nagging thought. Why didn't he seek Natasha out? He could've and they had worked together before--or did they? HYDRA had such a long and complicated history, it was sometimes hard to recall the details. But, she didn't have to think about that. She should be in the moment with him, flirting back..

"You're making a very tempting offer..." she murmured, leaning closer too. As for the 'challenge'...

"If I do quit before you do, I'll bring the drinks next time. Or..." she leaned in further, brushing her lips against his ear. Her warm breath tickling his skin. "If I keep up with you...we'll fool around in the shower."

Really, it was a win-win for both of them.