Witch
Khan's hunch about the aura-inhibiting items was on point. Abraham was wearing a ring and a pendant with those properties, but his mana became clearly visible once he removed them.
Abraham's military uniform followed, and Khan felt no shame in requesting his pants to go down. The scientist exposed his lean, slightly hairy, and out-of-shape body, even spreading his arms to make sure Khan could fully inspect him. Only his underwear remained on, but Khan didn't need them off.
Usually, Khan would imitate Liiza and press his palm on the man's chest, but the action felt pointless. Abraham was complying with every order without uttering a single question. He was offering himself to Khan completely, and his now-exposed mana confirmed his devotion.