I understand what u think, but you can't say '' he has no respect for his feelings'' because until now he hasn't shown his love for Keigo or tried to make Keigo his. As someone as Keigo's personality, Tomoya should do something or proove that he truly loves Keigo, and anyway it is too early to judge Keigo, we are in the beginning of story.
I mean that he shouldn't go straight to have sex with Tomoya a while after he found out about his feelings. It's just like saying 'I let you fuck me once so be happy, but I don't treat you seriously anyway'. I know that Tomoya didn't do anything to prove his feelings so far, but I think that Keigo isn't fair anyway. He knows what's going on and he's still acting like it's just a 'quick fucking' without any meaning (and probably he really thinks that way). Well, I hope you are right and Keigo will show his better side soon.
'' He knows what's going on and he's still acting like it's just a 'quick fucking' without any meaning '' < I think Keigo that kind of person, even If he know Tomoya's feeling he wouldn't treat him in another way or be gentle with him because he that kind of person who take everyting easy without a deep meaning or thinking ( don't because he wouldn't respect his feeling or will hurt him ) and maybe because Keigo like that Tomoya attractive to him ( Tomoya is the serious type) well let us see what will happen next chapter , when Tomoya finally decide to do something. <3 <3
Sadly, I can't bring myself to like Keigo at all. He acts like a jerk for Tomoya. He has no respect for his feelings, but he has no respect for himself too. Usually rape victim should have some kind of trauma and avoid the rapist at all costs, but Keigo seems to be ok with being his sex partner. He was sober this time, he could defend himself if he wanted, but he prefers whoring himself with the rapist. I can't even call him a victim anymore...