Athrun was being exceedingly, practicedly subtle.

Ostensibly listening to the lecture on integral calculus, textbook open on the desk, hand neatly copying problems off the chalkboard. Simultaneously, attention focused elsewhere in the classroom. Eyes tracing the smooth curve of her legs from the top of the black knee socks to the hem of the uniform skirt, riding up a slim thigh. Watching a piece of silky golden hair slide free of its pin and brush the obstinate set of her mouth. His own mouth slightly open, breathing slightly irregular, face slightly flushed from the sunshine through the window.

Shall I compare thee to a summer's day? Athrun thought, Thou art more lovely and more temperate.

Cagalli turned around in her seat to briefly glance in his direction. Bright, beautiful, warm eyes narrowing as she caught him staring dazedly.

…and he realized that he was absolutely, entirely, mad in love.