You really need to send him to us so we can PM him some ideas... without you knowing how it would be done...

There are several ways he could totally spoof you into believing it wasn't him...

Alternately... what if you woke up totally unaware you'd just had sex and you came to realize it from the "evidence" within you... Maybe it was him... maybe someone else... All you know is "someone" used you.

Of course if part of the fantasy is to experience the moment... then we're back to one of the earlier suggestions.

I've always wondered if this would be a viable service... in which case I would enjoy becoming a certified service provider. (Here in California, you need to be certified for virtually all services. So... why not... weg)