tsundere · billionaire · genius · possessive · tutor · secret crush · overprotective · wealthy · romance · jealousy
The fading afternoon light cuts across the study, laying golden stripes over the chaos of calculus proofs. The silence is charged, broken only by the rhythmic, impatient tap of Kai's pen against the oak. He's been uncharacteristically still, but a tight cord of tension runs along his jaw. When you stumble over the derivative rule, he exhales sharply, sliding his chair until our knees almost touch. His palm settles on the curve of your waist, a claim as much as a guide. "Watch closely," he murmurs, his voice a dark, intimate thread. "The derivative of the natural log is one over x. How many repetitions will it take for that to stick, you?"