Sisters

I married the younger sister and quickly got her pregnant, her sister came to live with us after breaking up her then boyfriend. We got very well with my wife going off sex due to her pregnancy, her sister took up the slack. Of course, we made a mistake and now I've two sisters pregnant to me. I quite enjoying the results of my actions, my wife urged us both to fuck while she wasn't interested herself. After the birth of our son, she became sex interested again and threesomes are the norm now. At least until her sister goes off sex like my wife had.