Cylus had brought Vanya into his office hoping to let the woman know that whatever they had in the past could not continue. Mina was right, he could not keep chasing after her while allowing someone else to have a false sense of hope. It was messy of him to get involved with her in the first place, as the woman was a Rue Entertainment employee and worked with his mother closely.
Cylus thought that a clean break was what was going to happen, but Vanya was incredibly good at working his body, and before he knew it, he had her bent over his desk screaming his name loud enough to pierce through the soundproofing of his office. It did not occur to him that she was doing it on purpose. She wanted his busy body receptionist to hear them so that the whole place would know her position.
