They've been dating 20 chapters, talked about all sorts of lewd stuff, but they've never even kissed? Jesus Christ, no wonder the poor dude bought a Tenga. This is pretty cruel.
I know I don't speak for all Americans, but I don't put ketchup on most of those things. I can barely stomach it as an adult on anything other than burgers, corn dogs, or fries. It's interesting how much your palate changes as you get older.
Oof. You're in love with a psycho, and not only that, you helped her do some depraved psycho shit, and now she's after some other dude, and thinks of you as a brother that she can just come to for help whenever. Can't wait to see how Narumi ties into the climax.