Shokushu Taikan no Mahou Shoujo ☆ Yuuri

Yuri is the sole magical girl standing against an isekai tentacle invasion. Despite her tireless efforts, as a novice, her wet holes are relentlessly violated by slippery tentacles, writhing in ecstasy! But these aren't ordinary tentacles—they target human wombs to plant a 'core' and multiply through forced birthing...! While Yuri ahe-cries as she's forced to birth tentacles, her senpai Keito decides to embrace the mad pleasure of tentacle birth...!?