Walkthroughs for each scene (and essentially the "ending") of each person is in the spoilers below.
SpoilerOpen up shop when Koyo asks you and you will end up at two choices. One choice will lead you to either Muhamad or Graham; the other will lead you to Feivel or Walker. It's a good saving spot if you want to see all CGI's/endings.
Bed for One: Willy's ending. Just fail to meet any of the other character's endings.
Pop Goes the Rabbit: Muhamad's ending. Hang out with Muhamad at the beach. Dance with him. When he asks you if you want to dance again, say no.
Learn to Relax: Feivel's ending. Head to the cafe, and then hang out with Feivel. When he offers to buy you coffee, say yes. However, be sure to say no to the rest.
I Got Your Back: Walker's ending. Go to the cafe, and then hang out with Walker. That's all!
Big Bear: Graham's ending. Go to the beach, and hang out with Graham. When he asks you where he should stay, do NOT offer for him to stay at your place for all 3 choices.
There's a hidden scene: When Koyo asks you to open up shop, just do a quick wank before you head out.
There is no ending for Koyo at the moment, so don't bother trying to get him. Currently there's no scene for #2, 4 and 7 in the menu either.
EDIT: Cleaned up my post so it's better. :P
Edited at 28/7/2015(Tue)02:24:39