 He was cast by Pascal Bonitzer for "Le Grand Alibi" and worked twice for Philippe Barassat, in "Folle de Rachid en transit sur Mars" and in "Lisa et le pilote d’avion".In 2009, he also starred in André Téchiné's "La Fille du RER" and in the television drama "Mes chères études", directed by Emmanuelle Bercot and dealing with a students' prostitution.In 2011, Demy appeared in Céline Sciamma's "Tomboy" and was cast as the lead in the romantic comedy "L'Art de séduire" by Guy Mazarguil.