Initially Naofumi believed Motoyasu played a part in framing him for raping Malty, but over time has come to realize that Motoyasu is very stupid and evidently doesn't know he's being manipulated by Malty. It was Motoyasu nearly taking Raphtalia away from him through a rigged duel which finally set Naofumi off enough to awaken the Shield of Wrath. Motoyasu tries to behave in a friendly manner towards Naofumi, despite the charges placed on him, but becomes something of a rival to him, especially with Malty's continued influence upon him. Once Naofumi's name is cleared he begins to show more of a kind side towards him, but refuses to accept it when he's told that Malty is the one who set him up. After Malty finally betrays him as well, Motoyasu completely breaks, falls completely in love(or lust) with Firo, and starts calling Naofumi Father in Law. He becomes even easier for Naofumi to manipulate, and all but swears loyalty to him.