I Became a Tentacle Monster that Corrupts Magical Girls Novel

My name's Hakuto. I'm 29, unemployed, and my only companions at night are my laptop and a box of tissues. Yeah, you can probably guess what that's about. My life was going absolutely nowhere until I found this weird gem while taking out the trash. A voice came from it, promising to give me everything I'd ever wanted. The catch? I had to become some kind of tentacle monster. So now I've got these black tentacles and dark powers, and my pathetic life got flipped upside down. I started hunting the city's "pure" Magical Girls, turning them into my devoted... well, let's call them loyal servants: The fame-hungry idol, the jealous older sister, the lonely queen, my dark harem keeps growing. But here's the thing nobody tells you: managing a team of superpowered teenage girls is way harder than it sounds. Now I'm stuck playing idol manager, organizing team-building activities, and breaking up their vicious catfights. It's more exhausting than a full-time job, and the benefits package is... complicated, to say the least. [Sexual Content Warning] Warning: Sexual Content, Harem of 5 (all virgins), Threesome, Corruption, Group Sex, Impregnation. Warning: Some vanilla hand holdings and serious nuzzling. NO NTR. Despite the name, tentacle sex is quite minimal lol.