Okay well I got the good ending with heather finally. Very hot... well done, I love how the sex scenes are done and they go for quite a while compared to many games. I remember now that on my first play through there was an extra scene in one of the transitional scenes which didn't happen on my second play through where I saved, so I obviously didn't do as well in the first section on that play through.
I have no idea how get with Megan and Heather... I tried talking to Megan and then asked heather about her at the bar. Again I tried checking her out then asking Megan. I guess there's something else I have to do differently...