Anyone manage to get David's path? I got the dream of his unlocked, and I know there is a sort of hidden encounter with him on Day 14 or 15 in the bathroom that only shows up after playing poker with Thomas in his room. I assume if I am being successful David will have Eric stay in his tent when they go camping on day 18?
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I got far on it accidentally. After seeing him in the gym and complimenting his body, the game seemed to turn on his path. You have some real and dream sex sequences if you keep finding him and eventually he appears in his room again, though I am not sure if the final sequence is a dream. I'd recommend just saving before any dialogue with him and trying the different options. If you end up going out of town with him and he gets drunk, you're on the right track.
I wish I knew! I was trying to follow Thomas' route and even went on the date with him, but then it switched to David. I would say just follow Thomas by sleeping in and going to dinner with him but also keep checking the gym for David. Eventually he summons you to go to town with him. It's frustrating, I know...