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Sümbül's transition to loyalty to Hürrem was more gradual: first he went with her out of necessity and not really having a choice after the convincing words of hers ("do you want to be loyal to Mahidevran and be a part of the past or do you want to be a part of the future?" or something like that), then he stayed because there was no other sultana currently residing in Topkapi and only focused on doing his duty and then he bonded with her over time.
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On one hand, Sümbül's servility is one of the things I enjoyed the most about him and I agree that S03 is the more dry part of their relationship, there it was more of a normal dynamic between a sultana and an eunich who has to fulfill her orders, so to say. Their relationship did undergo an evolution: it was interesting how such a well oriented in the harem, yet servile character who was known for pleasing all the forces in the harem (SS, Valide, Mahidevran, Hürrem) and move back and forth between them, ended up becoming so loyal to one person to the point of fully bonding with them.
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The strive of Hürrem's to find loyal servants was presented as far as the beginning of the season (and by the point Sümbül came over, she already had the first political ally in the face of Iskender Celebi) and Sümbül, who tried to be in every sultana's good graces until then, sought his interest and benefit and then the two crossed paths in a small, yet crucial moment. The fact that their cooperation began in the end of S02 is very fitting, because that was the season and the arc of status-quo changes, a point where they both were searching for allies. Hürrem and Sümbul is clearly the relationship that got most attention and development and it was an interesting turn in both Hürrem and Sümbul's characters.
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