It's great that you're so open with her ideas, and that you're contributing and making it all seem realistic. You two pride yourselves on staying in character with any of the crazy antics that you come up with. I'll admit, you've done it for this long, but by the time you had me find out about Sophie's past, I think you've warped me.
It was a life-changing experience, I'm sure. My personality towards Sophie might have shifted, but this doesn't account for how I act to Alek and Nariko at all. This is your doing, allowing myself, for the sake of your own fun, to change how I am and step out of character. I've been sitting in the corner, glaring at the carbon copy you've made of me and watched it take my place. I don't know where I am right now, but I've gone through not knowing that before, and I'm reaching out to come back.
Take that break and think carefully. If this isn't Riku, myself, speaking anymore, then you need to find your way around that. A character progresses along with the storyline but even with the Flashback stimulating some fatherly and lover-ly part of me, you can't expect me to act like that with everyone. What happened with Alek--why the hell would I do that with him in the first place? Because it was fun? Haven't I sworn allegiance to one person already? What happened to loyal, withdrawn Riku? It makes no sense. Not even the flashback should have changed that.
Think carefully, Mun. If you ever want me to come back and be dark, stone-cold, the true-natured Riku, give me a call, and I'll come back. Until then, have fun with your paper-thin, sex-happy character.