One day when I went to her house, her cute younger sister "Natsuki" welcomed me. Natsuki-chan, with breasts even bigger than her older sister, was tempting me with her braless and alluring figure! "Please do something to the rumbling of my uterus!" I sighed, wanting to get pregnant, knowing it was bad for my health, but I got excited and erect, secretly squeezing my seed from her!