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Pues si no mal me acuerdo en la ruta de Luther en cierta parte nos dice qué si meternos de nuevo en la pared o no y tenemos que aceptar para conseguir aquel final 

In that ending you have to not make Randal jealous, your main focus is spending as much time as possible with Luther while still not completely declining Randal, the only time you decline Randal is when he offers to play video games, then when you go to Luther (when you've spent enough time with him) you can finally confess, (if you didn't spend enough time with him) then you get the ending where he rejects your confession

The main focus is to spend time with luther while not upsetting randalTHEN reject Randal's offer to play video games with him and Sebastian and ta-da! As soon as you go to Luther again you can get the ending!! I hope this helps!