The plot I remember of it was that there was a VRMMO that allowed for adult situations. The guy playing was underage, but was using an adult's account. He meets a girl in that game that has a similar setup to him. It ends up with them meeting IRL and becoming lovers. They have a kid, though I can't remember if that's in the sequel or not. I'm looking for both, by the way. In the "sequel", as I'll call it, the boy is now an admin for the game. His daughter finds out that him and his mother have been meeting in the game to fuck, and wants to join in. There was some tentacles involved in that portion of the story, to hold her in place for her father. This was one I read a while back, and I'm not even sure it's on this site, but I'm certain I read it on the old version of Pururin.