• billet-doux, billets-doux
• to be enamored of sy, to be enamoured of sy, to be hooked on sy, to be in love with sy, to love
• lovesick, to be head over heels in love
• to be desperately in love
• to be desperate fond of sy
• to be desperate fond of sy
• amorously, loverlike, loverly, loverwise
• lovers, pair of turtles
• lovemaking, mush, philander
• flame, paramour, somebody
• more than over one's shoes in love