Just keep fucking her, she doesn't mind

You decide not to worry about her realizing that you are taking advantage of her; you can take care of that later. You concentrate on giving her a good hard fucking, and she does not seem to mind that a complete stranger is fucking her tight pussy. You release her left nipple and move your hand down between her legs, splitting her engorged labia with your fingers so you can rub her erect clit while you fuck her. She is so wet that your hand is soon dripping with her cunt juice and you focus on the hard nub of her clit, kneading between your fingers. She is almost screaming in pleasure as your cock continues to plow her pussy, while rubbing her clit. She climaxes quickly, her hips pumping back against your cock, and you can feel her cunt spasm around your hard cock as you continue to fuck her while she climaxes.

She keeps moaning loudly as you fuck her hard keeping her orgasm rolling, and you can feel your own orgasm beginning so you slam you cock to the hilt in her twat and grab both of her full breasts, pinching her stiff nipples between your fingers as you spurt your load of cum inside her. She is still climaxing and she does a nice job grinding her cunt against your cock, making your orgasm seem to last forever. You feel your cock spew four or five big shots of jism deep inside her tight fuck hole.

As you feel your orgasm ending you think at her, 'You can't see me again, I am invisible to you.' You pull your shrinking cock out of her cunt and back away from her. You can see yourself closely in the mirror, but she stands up and puts her hand to her wet cunt, then brings her fingers to her nose smelling your sperm that now fills her cunt. She looks very confused and you laugh to yourself as she tries to figure out how her cunt was filled without anyone being there. You see her pull a robe on herself and walk around the apartment looking for you. She does not seem to have recognized you, but just to be safe you think, forget that I was ever here, and that I fucked you.'

As you give her this command she stops and resumes what she was doing before you came into her apartment. Over a half an hour has gone by but she does not seem to notice and she goes back to getting ready to take a shower. You slip out the front door and head off to try your new ring on someone else.