Double the Trouble, Twice as Nice manga volume 1 features story and art by Ryo Ichino.

This was a mistake. A very big mistake. Well, it's not like Yuri Hayama could just abandon an unconscious child in the middle of the street…and since her phone was dead, she ended up bringing him back to her place, which leads to her current dilemma—there's a ridiculously hot guy in her bed! Plus, because he has a mysterious ability to transform from angelically cherubic to sinfully sexy and zero qualms about using it to get whatever he wants, he's already got her twisted around his little finger…