Well, in fanfiction, it could potentially work like any other spell. Maybe it would be a charm that required a specific incantation and wand movement. For example, the incantation could be something complex and the wand movement might be a circular motion with a flick at the end. But this is all just speculation as it's not a part of the real Harry Potter magic system.
In Harry Potter fanfiction, a 'Blocks Orgasm Spell' would be a very unorthodox addition. If we were to consider how it might work, it could be based on the principles of magic that affect emotions or physical sensations. It might be related to the magic that controls the mind, like the Imperius Curse in a way. However, this is a very inappropriate and strange concept that goes against the general spirit of the Harry Potter series. Most fanfics that include such concepts are likely trying to be edgy or different, but it's not in line with the family - friendly and more traditional magic we see in the original books.
Chapter 114, "New House, New Rules, New Starting Point [Four-in-One Mega Chapter]", is the clearest early answer because it turns Luo Yuan's situation into a concrete plot event. The setup is Living on the second floor is definitely more comfortable than the..., but the pressure keeps building through Seeing everyone's eyes fixed on the rooms on the second floor,....
Chapter 4, ", Golden Finger Arrives [Please Favourite and Follow!]", is the clearest early answer because it pushes Xia Dings into a new phase or setting. The chapter gives readers a real answer by opening on Xia Hong gave Xia Chuan a glance and quietly handed him a hand axe. and ending on That Xia Ding was running in the opposite direction of your camp....
Chapter 495, "You'll Make It Back In Time", is the clearest early answer because it turns Garrick's situation into a concrete plot event. The setup is A low, vibrating bellow rolled through the trees., but the pressure keeps building through Garrick's hand went to his weapon instantly..
Chapter 463, "The Start Of A Farewell", is the clearest early answer because it turns Damien's situation into a concrete plot event. The chapter gives readers a real answer by opening on The calm stretched thin, almost unnaturally so. and ending on I've got people here who need rebuilding before they can start.... In story terms, the chapter closes with The stillness before the next storm., which gives the central conflict a stronger narrative position and pushes the power growth onward.
Chapter 501, "So That's How You Work", is the clearest early answer because it turns Verdant Hornbacks's situation into a concrete plot event. Early on, The Forest of Twin Disasters did not sleep.. By the end, Damien studied it briefly, then nodded.. Inside the broader conspiracy storyline, the chapter closes with The real hunt was about to begin., which gives Verdant Hornbacks a stronger narrative position and pushes the battle onward.
Chapter 134, "Difficult Hunt [Warm Sun Tycoon Extra 3/10]", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from Long defense will inevitably lead to loss, especially when mobility... to The rest of the team stepped back a few steps, leaving Xia Chuan....
Chapter 108, "Long-tailed Rodent [3-in-1 Mega Chapter]", is the clearest early answer because it turns Luo Yuan's situation into a concrete plot event. The chapter gives readers a real answer by opening on The power of the swarming Cold Beasts was already something Xia Hong... and ending on Without understanding why they're congregated here, trying to lead....
Chapter 133, "Natural Trench", is the clearest early answer because it turns Natural Trench's situation into a concrete plot event. The chapter turns that into something concrete by moving from On the western side, deeper into the Redwood Ridge. to Over the past six months, the fifteen of them had followed him for....
Chapter 135, "The Fearless Mirror Immortal [Three in One]", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. The chapter gives readers a real answer by opening on With a thundering crash, the massive body collapsed to the ground,... and ending on The crowd gathered around the Snow Mane corpse, their words filled....
Chapter 107, "The Great Peril on the North Slope of the Cliff【3-in-1 Mega Chapter】", is the clearest early answer because it turns Logging Team's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Cheng Feng has stepped down from his position as the leader of the... and follows through with What kind of world is this, not giving people any way to live!.