ALDN-483 - It seems the mother-in-law is also pregnant. Tsukino Yuri.

“I apologize for suddenly showing you such an embarrassing sight… Two years ago, I lost my husband. At first, I spent my days grieving the loss of my husband, but as the grief healed, strangely enough, my sexual desire returned. Peeking at my daughter and son-in-law’s intimacy… I know I shouldn’t do such a thing… but, embarrassingly, I was satisfying my own uncontrollable sexual desire. Soon after, my daughter became pregnant… Originally, it should have been a very happy thing, but somewhere inside, I was envious of my daughter… And… I did something that even surprised myself… At that moment, my desire to become pregnant clearly awakened within me…”