Christina for hardcore? YES! But if not, she needs to be so much more creative. Often enough, a good boner comes from what you know it is there but you can't see it. To handle this kinda level, it needs some very good skills, situations like public and other kinky, maybe risky ideas. But this is what she not has at all = skills. Sexy skills, the will to tease comes from the inner devil, the natural horniness. This is the drive that forces us to risk something kinky and exciting.
She doesn't think like:
"Damn yes, i am sexy, yeah i feel so sexy, i enjoy to give them a boner!" "This gives me a great feeling and feeds my ego and i want more of it!"
Not a bit.
She could even give a nice handjob (NOT to a dildo!) and while shes doing it she licks her lips and smiles to the cam. Or Christina sits on a park bench, masturbating and some random guy walks to her and starts to jerk off on her tits. This all would be save. No need for sex but if well done, nice styling, good cam angles, maybe nice location and with pleasure... very very sexy.
There are endless, easy to realize and highly naughty ideas, even all without any sexual contact.
So easy to do, quick and save and without high production costs.
But naahh. Not a bit.
Sorry for my english but i think you all understand the essence.