If you're looking for manga similar to Zettai Junpaku: Mahou Shoujo, you might like these titles.
Yaida Masaki is a part timer, working as a janitor in a large publishing company. His hobbies include fantasizing about other girls, masturbating, and creating cosplay outfits for his fantasy girl: Oikawa Maiko. She is the daughter of the company president, and a far away existance for Yaida. Recently, Maiko has awoken to her magical powers that were asleep inside of her, but she has trouble controlling them. More often than not, she ends up completely naked and either unconscious or unable to move. Maiko's mother has assigned Yaida to be her guardian and mentor to train Maiko to be able to control her powers. Will Yaido be able to train her to control her powers and become a proper magical girl?
After once being very popular in her generation, the magical girl Klan mysteriously vanished. But after 7 years, she has finally returned! Not just her height, but her attitude and even her breasts have gotten bigger! Watch her battle as her voluptous body is literally bursting out of her clothes!
20 years ago, Weve Aliens arrived on Earth to search for marriage partners. Weve are perverted and love interbreeding. With their advanced technology, they have solved all the Earth's problems to do with the environment, food, and resources. Gen is a student at the prestigious Human-Weve school Shinryou Academy. Due to his late grandfather's words, he loathes Weve and believes that pure humans will eventually die out if something isn't done about Weves soon. However, Gen meets the Weve girl Mirika, who falls in love with him.
Yuto follows Mikoto, a childhood friend and high school girl who is one year older, to enter the same high school. When she goes home with Mikoto for the first time in a year, it turns out that Mikoto only sees Yuto as her younger brother. Yuto is a little dizzy about the difficult road ahead, but an alien "onee-san" in a very erotic outfit appears in front of the two...!?