I Secretly Stole My Sister's Boyfriend and Got Him to Creampie Me During Ovulation – The Fastest Way to Get Pregnant

Original title: こっそりお姉ちゃんの彼氏を奪っては排卵日に時短中出ししてもらい、最速で孕みました。

“Stole My Sister’s Man on Ovulation Day: One Creampie, One Baby!”

Miyuki is madly in love with her sister's boyfriend, Takumi, and is so in love with him that she can't control her feelings and approaches him even though her sister, Hana, is nearby, seducing him and asking for creampie sex.