To be fair here, yes you can have a 1:1 scene with Ron. For that he must really like you. And this is a romantic scene - so no Sex (yet).
Well, the only 1:1 I got was when he wasn't drunk and I disclosed Julian's plot, then Julian leaves and I stay with Ron, but then nothing really works, if I choose "caress" my score first rises, but then takes a dive cause Ron starts to talk about what I did with the couple. All other choices first decrease your points, BUT they actually avoid that topic and the loss of point is ultimately less, which I found rather incoherent. Then Ron goes to sleep and the game ends.
My relation score with Ron at the beginning of the scene is 4.75.The only other variation that I might be missing is if I never went to play with the professor and his wife, which might prompt Ron to say something else, but does it really change anything to the outcome of the scene ? (cause I would have to restart everything)
I got to cuddling with Ron after a major breadkdown, which made the date rape alternatives much more appealing (really loved the threesome, but Ron & Julian... oh so many combinations, so little time).
There is a consistency issue though: main character got out of the Head-couple abuse at the beginning before starting to enjoy his time with the puppy and also protested a lot, so carefully no indication was given that he enjoyed the visit to head-couple HQ. I even missed out playing with their lovely puppy u_u and got a hefty malus on my grades. All to have a romantic first time with my beloved Ron, after revealing Julians plot and driving that snake away. BUT STILL HE "SEES THROUGH MY LIES AND KNOWS I ENJOYED WHAT THE COUPLE MADE ME DO" despite that not being reflected by my actions or the game itself. Also, in a different timeline he still knows about the drugs, despite nobody ever telling him about them... perhaps some consistency issues?
BTW: love!!! the game... just miss the opportunity to give myself to Ned, as punishment to make up for whenever I "messed up" and "accidentally" messed around with someone else in front of him (oops, I did it again, Ned, please let me make it up to you as your leashed obedient footlicking slave dog whom of course you may ballbust again, whenever you see fit, You mean there even is a hidden basement room exactly for that? well, guess i am in for a lot of suffering and humiliation") and the opportunity to pay for him making my homework with an under the table BJ in the library (which he starts to demand on a regular base, so i have to do those, to incrementally increase my grades via Ned... 0:-)+