Young asian wife pleasuring her husband

After being introduced by a friend 3 years ago, Ryutarou and Kasumi got married after being strongly proposed. But from last year due to high stress and over working he becomes erectile dysfunctional. To regain his strength, he tells a young employee at an electronic store to fuck his wife. After watching his wife being fucked he regains his strength and fucks his wife again, but Kasumis feelings change