Call me crazy, but I'm more than a little tired of protagonists who use blackmail to get into someone's pants. To me it seems like he's not really someone I want to root for. He's just a weak, POS.
"The start of a rich girl series"? So you're telling me we get to look forward to an entire series of ojousamas? Amazing.
I like how he thinks to himself "I'm a real scumbag". Well, at least he's honest?
That ending though...Hmm, I was hoping for more, but I guess with a cliffhanger end like that, I'm certainly looking forward to the next chapter!