With you watching I would stand her between us arms distance from you. I would slowly undress her groping her at the same time. When she is completely naked I will test her wetness. If she is sufficiently wet I will tell her to moisten her own fingers and feed them to you. While she is feeding you I will whisper in her ear, tell him This man is about to fuck me. Then I would lower her to her knees and collar her so she knows she is going to be used. With my hand on her head I'd begin slowly face fucking her long deep strokes toward the back of her throat. As she gags I'd use her gag spit as lube. Catch that drool and rub it all over your ass crack, I tell her. Then!!!!!!