I wonder if y'all noticed it: from this line in page 2...
"See, if I think 'bout it, I've never been really close to other girls."
... to this line in page 4...
"Gonna fix this shit!! For their love!! For our friendship!!"
... everything in Rika's monologue is actually said out loud. That's right, said out loud to that guy she's riding cowgirl-style.
No surprise the poor dude doesn't really feel turned on -- and has to tell her to stop killing the mood and cut the mid-fuck heroic speech, lol.