Um the kid asked him to name him. Also like I said above just because the kid offered his body doesn't make this any less rape. So you can acknowledge that and still consider this rape.
It's a comic.... aka not real.. it's really not that deep
But since he offered his body, doesn't that mean he consents. Like, he just watched it on TV, he knows what was happening. What makes it rape is either if the seme forced himself on him or the catboy didn't say it was officially consented to (which is called grey/gray rape), but neither of those happened since the catboy himself said that that would be his payment.
There is no way he understands what sex is, so he can't give any consent to do it. Just because he saw it on TV doesn't mean he understands it. Plus, we don't know what age he is. He could be a minor for all we know.
Hey random kid you're kinda cute let me bring you into my house and let me bang you as payment! OH! And while I'm at it let me name you cause you remind me of a cat!