Three years into marriage, we decided to live with my mother-in-law for future planning, and she's moving in with us. My wife ordered me to abstain from ejaculation for fertility reasons, leaving me with an itchy cock every day. While helping my mother-in-law unpack, I couldn't resist her tight ass. I tried to hold back, but my erection wouldn't subside, so I immediately went for it! With her long legs, I pounded her from behind, lost in a frenzy of passion. I ended up creampieing her with all my potent sperm, accidentally impregnating her before my wife!