Normally, Millie is very protective of Moxxie and probably doesn't handle jealousy very well. Not that she's the type to get jealous easily; she seems very secure about herself and her marriage.
But I wanted to do what I can to sell this threesome as something that she would enjoy. And lording over Loona seemed like the solution.
P1: Millie's head pokes into view as she examines Loona take most of Moxxie's dick, but still not all the way.
MILLIE: Sweet nelly, you've got most of Moxxie down your throat!
P2: Millie pulls back Loona's hair from her face. Loona, still with Moxxie's dick resting in her mouth, looks up at her.
MILLIE: And the look on your face! You look so naughty. So goddamn bad.
P3: POV from Loona's eyes as she looks up at Millie, whose face is shrouded in shadow as she looks down at the camera/Loona.
MILLIE: How long have you been fantasizing about my husband's cock? You better appreciate it.
P4: Millie is behind Loona, her hands wrapped around Loona's head.
MILLIE: Its warmth. Its smoothness. Its taste. Is it all like you've imagined?