Thrust one more time and let go.

As your orgasm nears, you pull back, pushing your wife off of you, then slam into her one final time, letting a fountain of cum rush into her womb. Spurt after spurt hits her vaginal walls as your cock begins to slowly wilt within.

Your wife sighs, then looks down at you with rare disappointment.

"You promised," she whispers, rolling off of you with a loud plop. She begins walking towards the shower, grabbing her robe from the closet and wrapping it around herself tightly. She looks back at you and shakes her head, obviously unhappy with your performance.