Wait, what? Every single main girl penetration scene that has happened so far are in the real world, while the stuff that has happened in Eternum are mostly foreplay stuff. The only penetration scenes that have happened in Eternum are for 2 side girls (and no, that moment where
Nan got penetrated halfway by Orion before they got rudely interrupted doesn't count). So what are you on about?
Unless you're referring to Caly, in which case we'll have to wait and see. One of the popular theories is that she'll cross over at some point in the real world, so banging her while she's in the real could be a possibility if that happens.