I don't know why people complain about the dialogue. All I can see are two (cute) beings with low selfconsciousness trying not to lose their partner. I think that, if you really want only to read "YES YES FUCK ME HARD" you shouldn't complain about this but just go and read something else.
Also keep in mind that writing such a story isn't as simple as it sounds, even if it is "only" a short comic. And the dialogues are probably the hardest part.