I agree with you man. This isn't really Vanilla. This is just about two people who fucked and might fuck again. They have no history or real love. It's hot as hell though XD
Kami-sama Alone Knows how many more *a-hem* "lies, half-truths and innuendoes" Kyouko might have thrown at Tanaka, had this story gone on longer. At the very least he got some *a-hem, again* "compensation" for letting her stay for one night ... although it seems that she seemed to like it so much that she says she'll be back. IRL, "RED ALERT!" ... in the H-Universe, the male protagonist gets his due in the end.
Hmm, well, it's nice to see that our protagonist is quite a nice guy. I mean, he was resistant to the idea at first, but eventually caved to her pleading.
In the end, she was just lying about her circumstances and just wanted to stay over at his place. But hey, I liked how he was genuinely being considerate about her situation when he thought it was true.