Stop touching them right before they climax
OMG its been a long time sense I played that game but I was sure this was that game and was wondering WTF.
While touching them anywhere, I would stop auto fucking them right before they climaxed and it worked.
I figured it out I thought it was the little heart icon on the left rising but It was the meter you have to stop it before it reaches full right?
I wish someone would help us... Anyway, from the little I've found after giving up trying to get the true ending on hard, you have to spread out to get experience in all different spots for each of the girls, because as the girls gain experience in specific areas they develop slower and slower. Also, I get the feeling that if I focused on one area too much during a session I made less progress than when I spread out, but I'm not sure... As far as I can tell, the slowest speed is the most efficient in terms of experience/energy cost. It feels to me like each girl is a bit more difficult than the previous one. In any case, so long as you don't play on hard and you get the gist of what you're doing you should be set to get the true ending easily enough.
