She hates it, because it’s yet another indignity heaped upon her in this form, but Nott goes into heat.

The frequency and duration is up to you - it could be distressingly frequent or it could be something that has only happened once or twice since she met the nein.

It definitely happened before with the goblins though, and they took full advantage of it (possibly also other times since escaping the goblins - perhaps Caleb has had to intercede to stop others from hurting her because of it) and left her even more traumatised than before.

Either way, she hates it, hates herself for it, and finds herself dripping and trembling with need.
She has to at least masturbate multiple times while it’s happening, except she also can’t let herself enjoy it.
She doesn’t want anyone to know, except it’s hard to keep something so urgent and irresistible hidden.

If you choose to have it go that far, Caleb is probably the first to notice and try to help, but even though she’s desperate for it, she can’t help but be disgusted with herself and the situation, and wrongly believes he hates to have to do it, when really he just hates that she’s hurting.

+ if Caleb is the first human-sized thing she’s hand in her.
+ + if Nott is terrified
+ + if Nott was on heat in the cell when she and Caleb met
+ + if Nott’s pussy is visibly swollen and dripping whenever she’s in heat to an extent that it’s hard for regular light clothes to hide.
+ + + if goblins have a thing where they clamp down during orgasm and don’t let the penis back out for some time (like a reverse knot)

- - an M9 member outright raping Nott
- - graphic injury.
- - unwanted pregnancy
- - oviposition