I want a bj from my mom?

So I really want a bj from my mom, and to test her 'attitude' toward bjs, I texted her a sex joke that involved a bj and her first response was my name with just a period. Then right after she texted a smiley face. How else should I approach this? I think my mom has a really hot butt and my desire is that I eventually get to grease her butt and put my dick between her *** cheeks. That plus a bj. No sex really. Help?