Ugh, no offense to you, but I personally do not see the appeal of a game like APC. To this day, I still refer to it as my worst decision in terms of eroge.
OK, now that I have that out of my system, it would be useful if you told us what in particular about the game you liked so that we can give suggestions as to what else you might enjoy. If you enjoyed the fact that it was a sex romp, then you are pretty much safe with anything made by ZyX, from what I understand (due to what I��ve heard here, and the experience of playing APC, which is a ZyX game).
I’ve actually heard good things (for the most part) about Sagara Family, despite the sex romp nature of it (which seems to be par for the course since it is a ZyX game). That being, that it actually has a semi-decent plot, and lots of humor.