If you think about it, there are people who sell a kidney in order to get a phone so trading sex with your kind of childhood friend for a phone is not the worst idea...
"It won't really matter how you ask for it"?
Come now, it's Hentai, there is always a way to get what you want.
Still, I can think of a lot of worse things that you can do in order to get money for a phone, so I'm glad it turned out this way.