Jack realizes the ring is no longer on his finger. He looks around and cannot find it. In his soul he knows that its power must've been totally used up by the major wish that body-swapped everyone at the beach.
Jack looks at his purse -- somehow he knows it's his purse. He then 'remembers' shopping for the purse with his ...girlfriend...
...Then he 'remembers' he has a girlfriend.
"Thank goodness! At least i don't have to have sex with men! I love Susan and at least I'm still with her!"
In his purse, he finds his driver's license, confirming his female identity as "Rachel". His apartment key and car key are the same. There are a couple of wrapped tampons in his purse, and all the usual things.
There's nothing else to do but head home and face Susan.
He arrives home about 18 minutes later, and finds that Susan is preparing dinner. She greets 'Rachel' with a kiss. Jack, no 'Rachel', is totally freaked out at the prospect that he is a girl, still has Susan as his girlfriend, and that she kissed him as if nothing was out of the ordinary.
Rachel takes a few steps back and kisses Susan again. Susan is surprised, but it quickly turns into a passionate deep kiss between them. Susan abandons her food prep and gives a deep hug and body caress to Rachel. Then takes Rachel by the hand and leads her to the bedroom. Susan quickly peels off Rachel's skirted bikini bottom and begins cupping her mound. "Why are you already so wet, Rachel?! It's like you haven't seen me in a year or something!"
Jack/Rachel suddenly wants to f--- Susan like he's never wanted to before. But this makes him aware in the most psychologically devastating sense, that he cannot f--- Susan. He is now a girl just like her. He has a flat, smooth vagina, just like her. He has ovaries and a uterus, just like her. He has breasts, just like her.
He doesn't have a penis - and never will again! - so he can never enter her again! He will never feel her vagina tightly contracting around his shaft when he brings her to orgasm. He will never feel his prostate building up fluid, blending with sperm from his testicles, and urgently spurting it out at the moment of orgasm. It will all be girl-girl now. He will only ever have girl-orgasms. He will only ever have this flat, smooth tummy and crotch.
He is immensely sad at this thought. He will never penetrate her again! His wish effectively castrated himself.
But then Susan's continuing touch - cupping and now fingering his crotch - brings him back to reality. He is very wet and is very eager to feel his first female orgasm with the woman he loves.