So you think you can cum three times? (Mouth, Missionary and Doggy? I hope you have viagra!) Missionary is not one I have thought of but it would be great to see the cum dropping down her pussy. She gets really wet so you should slide nicely.
Doggy is one I have thought of and I'd want her facing me, making eye contact with me and maybe even kissing me. I'd like to see you holding her hips with your hands. The reason I say maybe kissing me, if you are a full 9in, then she may have to not he on her hands or elbows, she may need her face on the bed with her ass up.
Then, when you finish she will sit on my face with her bush rubbing against me and cum dripping down. That is often how we see it in Interracial Cuck videos.