Seigi no Henshin Heroin ga Ore o Mikudasu Shimai datta node Yowami ni Tsukekomi Sennou Choukyou de Chinpo Gurui no Haramibukuro ni Otosu!! The Motion Anime

Seigi no Henshin Heroin ga Ore o Mikudasu Shimai datta node Yowami ni Tsukekomi Sennou Choukyou de Chinpo Gurui no Haramibukuro ni Otosu!! The Motion Anime - an animated comic by studio Survive based on the eponymous CGI manga by Poruchini (Ariuo) in 2022. 

The father of the main character of the story remarries, and he gets two sisters, beautiful and cute, but the two sisters avoid, insult, and look down on their new brother, a shy and unpopular guy. He harbors dark feelings towards these two arrogant, proud women who treat him like garbage, and he has a hobby of masturbating to them. He uses them as toys for his dark hobby - masturbation. One day, returning home from a part-time job, he passes by a park and sees a stunning sight. Two girls in cartoon hero costumes engage in a fierce battle with a strangely shaped monster he has never seen before. He immediately turned on his phone to record a video. If you think about it, there was a story that has been talked about on social media for some time. A mysterious new religious organization called 'Lunar Dark', claiming to 'bring the world to its knees'. A mysterious monster called 'Otherworldly Beast', developed by the organization, attacks people and devours them. The hero kept his phone pointed at the monster to record everything, but the battle seemed to be swift. With a blinding flash, the deformed monster disappears. The two girls confirm each other's safety, and the costumes they wore disappear, revealing their true faces. Their true faces are revealed. They are a pair of cheeky and naughty sisters, cursing themselves for living under the same roof as our hero. The hero uncovered a real treasure - compromising material on the sisters. His dark desires intensify even more.