This manga looked amusing, to say the least, and is definitely a must read for anyone with a loli/imouto thing going on. Here's a brief summary, according to one manga
onemanga wrote...
Summary
Noa's brother has a huge sister complex. So huge, he attends college in Tokyo just to escape it! Years later, his sister Noa shows up and informs him that she's taking the Tokyo University Entrance exam and that she may be moving to Tokyo as well. Little does Noa's brother know, she has a similarly huge brother complex. Read as Noa's brother attempts to control himself around his little sister, while she sets him up for failure.
There's one chapter up so far, but it gives a pretty good idea where this is going. Not sure exactly how perverted it is going to get, but at the very least it is amusing to read. Go check it out, if you're bored. Here's a little taste.