"Really?" she manages to murmur with a smile before he leans in for a kiss, through and focused -- it has the same kind of quiet intensity he devotes to his projects, Pepper thinks with a soft shiver -- unlike any of the kisses they've traded before, loving the gentle press of his palm over her throat. Her own hand slips down his front to palm his waist, fingers drawing tiny patterns through his shirt. A softest little hum leaves her when the kiss winds down; pleased, fondly amused and a little aroused all at once. It's hard not to let her smile shift more toward a smirk, picking up her train of thought from a moment ago -- thought it now has a more tangible connotation, feeling his predicament as their hips bump gently. "Math turns you on?"