The first instance of the pairing began in Saint Valentine's Day (when Jim was talking to "Mr. Delmas" about a "matter" concerning Suzanne), and in the next episode (just before he is possessed by XANA) he is musing about her for a moment. Another instance occurred in Lyoko Minus One, where Jim is complimenting Suzanne about her perfume after he addresses her about the dangers of pollution.
After Suzanne hears Jim talking about how he was once a professional ballroom dancer in Bueno Aires, she persuades Jim to teach all kinds of dancing techniques in a very romantic way in Nobody in Particular. (She called Jim "darling" during the scene as well, and sounded quite flirtatious in general, even touching him.) Of course, since he was possessed by Ulrich, he seemed to angrily refuse the lessons unless she give "Stern" a second chance to do better in his classes. He has come with her on some of her field trips as well, not only to be within eyeshot and earshot of the children but to be near Suzanne. He once asked her about her new boyfriend, "Pedro", and she commented "Jim, not in front of the kids!". However, in the next episode, she unfortunately threatens to kill him if he gets "a hair" closer to her face (when Sophie Florenceau suggested to him that he give Suzanne mouth-to-mouth; this incited the kids to giggle for a moment). When he is jostling her awake, he sounds like he loves her and is close to kissing her.
In Code Lyoko: Quest for Infinity, Milly and Tamiya mention that the two are dating, which Jim gladly confirms. However, Suzanne angrily denies any instances of a relationship with him. Despite this, the situation does confirm that his interest in Suzanne is indeed romantic.
