My wife, Isanao, always had an intense libido, and I was deeply committed to satisfying her. But recently, my body hasn't kept up, leaving me unable to fulfill her desires. Desperate to resolve both my inadequacy and her growing frustration, I suggested inviting my well-endowed best friend to sleep with her. At first, she resisted, but gradually she began craving it herself—and watching her transformation filled me with overwhelming excitement. Witnessing her change and the new thrill it brought made my heart race with arousal.