Ves understood that he had entered into a negotiation with Mayra. The pirate mech designer wanted something from Ves.
While she could have put Ketis under the tutelage of any other pirate mech designer, hardly any of them possessed the foundation and experience of a legitimate mech designer, let alone an aberration like him!
Before the conversation turned into this direction, Ves hadn't obscured his own background. Though he attempted to understate his accomplishments for fear of sparking any suspicions, his meteoric rise nonetheless marked him out as a mech designer with a bright future ahead of himself. It was no wonder that Mayra thought favorable to him to the point of wanting to put Ketis under his wing.
As long as Major Verle and Professor Velten cleared the decision, he wasn't opposed to the decision. In fact, he even figured the exchange of favors might tie the Swordmaidens closer to the Vandals.