He gets run down by Jacques Marbeuf while riding his motorised push bike home. Jacques picks up the body and takes it into his home. Jacques Marbeuf and Alban Ceray seem to be scientists of some sort and they experiment on Yves, making him into an intermittently and sometimes partially invisible android. He exploits this to take advantage of Cathy Ménard, invisibly, then of Beatrice Vidal, hands and cock visible, then Marianne and Eva, until the invisibility wears off completely.