This wife wants to know: Cum with, on or in?
You already know this cuckold fantasy has a right answer, even if your mouth goes dry trying to say it out loud.
You watch her lean back, completely comfortable in her own want, eyes holding yours like a dare you're not sure you can meet. You feel the question land somewhere below your stomach, pulling at something honest and hungry in you.
You realize the choice itself is the whole point — that she's handing you permission and pressure at once. You want all three answers simultaneously, and that need tells you everything about where you actually stand.