If it's a reference to H-games, how does it fit with either the series' premise, or Ryosuke's character? He's never shown playing so much as a Dating Sim; much less, an eroge.
Why did Iria make a contract with Caesar?
Even if Iria was desperate after turning her back on Merlot, what made her choose Ryosuke's dog, rather than Meshiyori who she knows has a sprit level of 1 million?