Ask why she's so interested.

"Why are you so interested in what's going on here?" he asked, gesturing down at himself with one hand. She was already staring at him, there was probably no point in covering up.

Maria shrugged, a playful grin on her face. "I have been in the States for all of the summer so far. And I haven't really had time to find any guys to flirt with. " The tone in her voice implied that maybe she was considering flirting with Jake. "What about you? Has anyone caught you're interested in?"

[Jake confesses his interest in Sarah to Maria.]

[Jake decides to make a move on Maria.]

[Asks, "Are you trying to flirt with me?"]