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tldr is under the spoiler

TL;DR: It's basically the rape route. Just because Arvo does it all willingly doesn't make it better - he was taken advantage of and manipulated into those actions.

Torulf spent his youth working and making money, then realized he lost something he will never be able to get back - the excitement of exploring his sexuality in that tender age he left behind.

So now he's compensating himself by stealing that experience from young trusting boys. He is nice, and gentle, and generous, but this is just a way to lure people like Lake and Arvo into doing something they don't really want to. They want to be seen, and felt, and loved, but he's substituting it for lust and keeping them at a hand's length, never truly giving them what they want, making them suffer, while having all the fun he wants with them.

Mikko sees right through Torulf, because he is mentally more developed and experienced than Arvo and Lake combined - he had his heart crushed before, he's been in a relationship, and no doubt he had people hit on him only being interested in some action. He quickly figured out Torulf doesn't need anything more than  leeching love and adoration from the boys who don't know any better.

At the moment of the bar scene, Arvo is in love with Torulf, and Lake hates himself and is afraid to be alone again. 

Lake came to terms with his situation, persuading himself this is the best he can do, content to be Torulf's fucktoy, but he recognizes the situation Arvo is in, since he's been there himself not so long ago. Arvo thinks he is in a relationship with Torulf, but he is just a toy. 

Lake feels horrible for Arvo and wishes he could explain it all, but he doesn't have the strength, he is afraid to lose what little good grace he has with Torulf, so he just sits there, watching Arvo dying inside, feeling like shit about it. Meanwhile Arvo doesn't understand why Torulf is openly hitting on Lake in front of him, driving home the point that having Arvo isn't enough for Torulf, that what they had meant nothing to him. Arvo is dying a thousand deaths in that bar scene and so is Lake. All while Torulf is having the time of his life, playing with two cute boys who can't say no to him.

Torulf route could be even more on the nose only if he actually raped Lake and Arvo, but there was never any need for that, he poisoned them with adoration for him, tied them to himself in a way no rope ever could, and now does whatever he wants with their bodies. This is vile and truly horrifying in how manipulative and cynical it is. 

Having been in this situation myself, I must say it was described almost beat by beat how I experienced it, though in real life there was more time between events. Going through the experience Lake and Arvo did feels like becoming dirty  under your skin, dirty in a way you will never be able to wash off. I heard actual rape victims describe their experience this way and I'm not surprised.