It was very obvious that Moriyama was in love with Yanaka this whole time, yet wasn't able to make his feelings known. So, he used this opportunity, and I like how slow and steady he went about it. That explains why he was so bent on not going past second base with YK. This was such a simple, short, and sweet love story about simply falling in love. I like how simple this story was, from the initial contact and pretense to the backstory. This isn't fake; I'm falling in love, and there's no hesitation in how easily this story flowed when they decided to move from a contractual into a real relationship with real feelings involved.
Koibito Keiyaku Chuu ni Tsuki