My wife is pregnant... and recently gave birth to our long-awaited first child. My wife's sister came to our house to celebrate the birth of our baby, but her defenseless panty shots and breast shots as she dotes on the baby were so stimulating for me, who hadn't had sex with my wife for over a year and a half, that I got an erection without even thinking about it! My sisters-in-law noticed that my penis was about to explode and gently comforted it... I had a dream-like sex session with my beautiful sister-in-law, who is nothing like my wife!