A new fantasy I would really like to live out some

Now as you can see from my profile I LOVE when women get a huge, loud and shaky orgasm. It's most likely my biggest fetish.
I've always like to watch women ride a sybian. It's one of the best sex-toys you can get. My fantasy is, to sit behind a woman and hold her down so she can't get off the sybian. Why she just enjoy herself I would rub her in oil and massage her clit and breasts, really fondle them in my hands.
When she orgasms I would hold tightly around her so she can't get off, bite and lick her neck and feel her breath go out of control. Just feeling her body tremble as she begs to get off.
I would do everything I could through my massage techniques to stimulate her even more. I would be naked doing this so I could press myself against her back for her to feel my hard cock press against her, so she knows how turned on I am for pleasuring her.

I don't necessarily want sex with her after that. It would be lovely but only if she wants. Else I'll just lay down with her as she calms down from the experience, maybe give her a more relaxing massage and just let her sleep.
If she wants to give me a blowjob or asks me to fuck her I would do so of course. But the fantasy is foremost for her pleasure and just to feel her cum as hard as possible.

I've had this fantasy for a long time. I don't really care if it's with a straight or a lesbian woman or if her partner is there as long as she don't mind me being naked, feeling my cock on her back and having me massage her in oil.

Thanks for reading, I hope I can live it out one day =)