Trouble HOME! Giri no Haha to Imouto wa Koi Gataki by lilith - Adult Sex Game

Masaru, the hero of this story, has lost his parents and is now living with his stepmother and school principal Suzuka, and his friend and stepsister Rin.
One day the delicate balance between the three of them crumbles, and their home becomes a dangerous battlefield. There is love, there is fighting, there is pregnancy and there are hidden stashes of erotic literature!