Try and make her promise even more!

I clear my throat, "Yeah that's the thing Chloe... Because of that it will be really hard for me to show you all the wonderful things I can do with your butt."

She looks amused at first but then a little worried. I continue "You see there are so many things I should do with your ass before I fuck it." I say giving her a decent spank. Soliciting a "Ooow!" From her. "Kiss it, lick it, finger it and so much more." I look away from her ass and look straight at her "But I'm afraid we won't have time for all that now."

I push down my cock between her cheeks again and start rubbing it hard in her crack. Many times brushing up against her pink asshole. "Plus I'm really dying to just fuck it but I don't want to waste my chance to do anything I want with just that. You deserve so much more!"

She tenses up every time my cockhead pokes her butthole. Clearly not used to the feeling of having something nose around there. I know it's mean to pressure her like this but I can't help myself. I must try, what if she will let me do this again?

She listen closely to everything I say, with quite the blank expression that's hard for me to figure out. Only for her to smile and cuddle down against her pillow. "What if you became my boyfriend then? Then you would have all the time in the world to live out all your perverted fantasies you've built over the years."

"Wait Chloe is that an offer? Will you really let me fuck you in the ass whenever I want if I'm your man?" I say completely shocked.

She is still nestled in her pillow being mighty embarrassed "Well I mean I can't do it all the time. I have a life too you know but yeah what kind of girlfriend would I be if I didn't let my boyfriend have access to all of me. If my ass is what you really are longing for well then I guess I just have to get used to anal."