I'm wondering if anyone can help me locate the name or doujin itself that is about a step mom pretending to be the step sister to this guy. It was like 2 chapters long and basically started off with this very young looking girl moving into this house and hitting on the new son. After a little while the real daughter comes around and you find out the super young looking girl was the step mom the entire time.
Pic not related.
Thank you to anyone that can help.