Yeah. He's so used to everyone using him that finding someone who didn't just want to fuck him completely threw him off. And it's like since he knows he blew it, he's going to take as much as he can from Masataka physically since he'll never be able to get any more, even though it's killing Masataka, and in a lot of ways killing Souma, too.
A story like this just cannot end well, it really can't, and I'm terrified and looking forward to it all at the same time. And I really hope Yuu Watase writes more BL; it's nice to see realism injected into the genre.