I really don't know. Such topics are not something that should be encouraged or explored. Tumblr should have measures in place to prevent such inappropriate content from being shared.
This story is inappropriate because it depicts a perverse and abnormal relationship that is not only against social norms but also harmful to the mental and moral well-being of both the creator and the audience. It should be strongly condemned.
Well, instead of that inappropriate theme, we can consider stories about fulfilling a partner's fantasy in a healthy and consensual way. For example, a couple where one partner has always wanted to travel to a specific place and the other plans a surprise trip there. It's all about mutual understanding and making dreams come true in a positive relationship context.
Communication is key. For instance, if your partner has a fantasy of having a romantic dinner on a rooftop overlooking the city, you can plan it all out, from the menu to the decor. This shows that you listen to their desires and are willing to make them come true in a respectful way.
Sharing such stories is completely inappropriate and violates privacy and social norms. This is a very private and inappropriate topic that should not be publicly discussed.