How do you get to have the interactions with Ron I seen pictures he is in your bed and stuff how do I get those to happen ?

There is no easy answer to that. There are several possible choices leading to this. I am sure you will figure it out! 

I managed to get Ron to seek in the bed and cuddle but is there away to get a 1 on 1 going with just Ron and not Julian 

someone can tell me how unlock the scene in after party where the main character and julian cooperate to fuck ron i try all routes but i could not unlock this scene that i found in game files