How the process to gender switch is handled

For Reader Impact:

I think we want readers to pick up on his feelings before MC does
The subtext in his earlier reactions lets readers piece it together
Makes the emotional breakdown more powerful when it happens
Readers can see it building while MC remains oblivious
Creates dramatic irony that enhances the scene

The Build-up ():

Jealously watching how women around him easily access happiness
Close proximity, camaraderie to MC but unable to bridge that gender gap pricks at him
Gets more distracted/emotional around MC
Jiaolong having sex with MC (potentially a different scene could work as well) triggers him (optional)
He talks with Jiaolong who leaks the conversation to MC as something you may want to know.
You just use your magecraft on him in the night. It's your advanced medical magecraft knowledge, coupled with necromancy. He takes 5 days to recover while unconscious.
She wakes up a woman, dealing with both (temporary) physical pain and emotional adjustment and then finds you and confesses her love for you.

Shows Jiaolong's complex role:

She's his confidante but also "betrays" him by telling MC
Her own experience with MC might push her to help Sunwei
Creates interesting dynamic between them
Adds to Jiaolong's character development too

The Scene Flow:

Confides in Jiaolong during their work:

Trying to stay professional but emotion leaks through
Shows his research into the possibility
Jiaolong recognizes the deeper meaning behind his "academic interest"

MC learns from Jiaolong and just does it:

Treats it as practical decision
Another asset to control/reward
Very matter-of-fact about it
Sunwei just wakes up as a woman one day

The emotional scene happens after transformation:

Now she can properly express feelings
The physical change releases emotional barriers
More natural for the romance aspect
Can be more explicit about desire/submission
Works better as female character expressing devotion to MC