Nimhe's ponygirl quest is not starting. I already watched the ponygirl galaxia episode and did the sent T'ris to pet training 3 times.
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Which part in below steps is not working?
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After you have seen the Galaxina “Ponygirl” episode, chat with Nimhe.
She expresses interest in a cosplay outfit along those lines. It can be bought in the Krell Pet Store on Arellarti if you have done Krogneath's Favour Quest later in the game and received the Pet Voucher.
If you try to take Nimhe on a ship walk in the Ponygirl outfit, she’ll refuse but agree to practice walks on Iltari Station. You can walk her in her normal uniform there until her EXH reaches 9 with various scenes.
Once Nimhe has EXH 9 and SUB 4 (get SUB1,2,3 with spanking and 4 with gifting her the Pony costume) you can ask her again for the Pony Walk
You can walk her twice, with her SUB going up to 5 after the second walk & gallery achievement
Once Nimhe has seen you taking out Seraphine (see Seraphine's quest) for some Pony Walks (3) she approaches you and wants Pony Walks in the Dome for herself.