well, the easy out would be Ryouga becoming his girlfriend and the rest of the girls giving up because they can't match someone as strong and uh big as her.
He's already on road to eroge harem protagonist lol. Congratulations my boy ichirou, now you're gonna be the center of attention whetever you like it or not *clap clap*
No, you fool! Don't bemoan your current circumstances! You need to start making preparations to avoid dragging the shitty vampire into your harem! USE THAT GENRE SAVVY TO EXERCISE SOME BASIC PATTERN RECOGNITION!