「あのとき助けていただいたモンスター娘です。」異世界おっさん教師 突然のモテ期に困惑する(1)

[DeepL Translation - needs review] Volume 1: A little octopus pupil turns into a flabby little monster girl! After being summoned to another world for 20 years, Washio has become an enigmatic teacher. One day, however, he is embraced by a beautiful girl with big breasts... She is the monster girl who saved me back then! The situation changes drastically when the monsters, who have mutated into humanoid forms, take a liking to him! What will happen to his life as a teacher? A love comedy betw...