"I wish that we would swap genitals, and genital related sexual preferences."
You stare at her, slightly stunned.
"What? I got curious after seeing your face when you... um, orgasmed..."
You feel a twinge in your head, probably your 'genital related sexual preferences' changing, then you feel strange sensations in your groin as your penis changes, you can't see what's going on through the foamy water in the hot-tub, and before you can stand up to see it's all over.
Amanda stands up. Your eyes are about level with her groin and she's half hard... and you definitely notice, and it feels very strange, as does the lack of anything between your legs.
"Want to head over to the bed and try things out?" Amanda asks.
The arousal you're feeling about her half-hard dick makes the offer very inviting.