On the chalkboard, the numbers and symbols multiply, their meanings shifting from mathematical to carnal. Richard's voice, usually steady and calm, grows hoarse as he narrates the erotic tale of these abstract entities. He speaks of derivatives as the soft touch of skin, of integrals as the slow, tantalizing build-up of pleasure. His hands, once steady and precise, now tremble as they trace the paths of these imaginary lovers, their fingers brushing against each other, their bodies pressing close. In this dance of numbers, Richard finds not just mathematical truth, but a deep, sensual understanding of love.