Will your next game be referencing OIAL and Eternum like those two did between themselves (hence cooking the best adult VN trilogy), or it will be part of a completely different universe?
I will avoid spoilers
It does near the end when your step sister talks about a new hyper realistic game called Eternum, that was going to be published in the near future and was excited to play it. Another reference is the secret ending (to achieve it you need to avoid every romance). I don't know if there are other less obvious references.