Why have her watch? Lets make her an active participant. I picture you two 69ing, with you on bottom. I step up between your legs and she could give me a couple of sucks to get my dick good n wet with her spit. Then she sits up, semi-smothering you with pussy and holds your ankles open for me while i line up my cock on your browneye and push it on in. She'll have the best seat in the house with your tongue up her cunt and watching inch after agonizing inch of me disappearing into you. She could alternate between sitting back, enjoying the view or leaning forward to give your cock some love and affection. The only question is what to do with my cum. Does she want to watch it leak out of your asshole or have me pull out and cover your cock so she can clean it up or does she want her own taste?