Mistress Ava Black realized that this guy wanted to have a threesome with her and her friend and she was offended. She would not have fucked him even if he wanted her alone, but she took advantage of him wanting to fuck both of them to dominate him. She invited her friend and they laid a trap for him and when he took the bait, they enjoyed dominating him. They spat into his mouth and he swallowed it among other things.