Everyone in Cheliax is insane and he would ask who needs this stuff but apparently the answer is "You, Keltham."
He's... just going to go with the illusionary white-hot metal rod, which seems like something he could use in very light taps to be scary and painful but not completely take her mind away from the sex part. Actually he's going to try the illusionary knife before he goes to the illusionary rod, maybe that just works.