Hmmm not sure what the line is between grooming and not grooming but this is definitely walking it.
As a young boy the heir of a martial arts clan is sent to live with 'the great healer' in a forest. He raises him and creates an entire fake world in order to make him comfortable. He becomes obsessed and treats him like he is precious. He goes to war over him. His affection is very overbearing and some other morally dubious things occur.
Ordinary man is transported into a magical world where the emperor becomes obsessed with him. He struggles to fit into the harsh world. The emperor treats him like a piece of glass and tries to give him the best of everything in order to keep him by his side.
Ordinary civilian bottom attends an elite boys school. The 'God' top of the school falls in love with him and immediately is extremely possessed and obsessive. Bottom realises this is not normal and discovers the strange system that exists and faces danger from the tops fanatical followers. The top is obsessed with the bottom who was the only light in his life and tries to protect him from the world by keeping him in his room and giving him whatever he wants.
Set at an intergalactic university. An elite alien is triggered into mating by a normal human. The alien becomes obsessed with the human and treats him like breakable glass. Things get kinky ( there are multiple copies of the alien) and he is very obsessed and watches him everywhere he goes.
Ancient east Asia setting. Bottom is a hero from the war who is suffering due to ( what he believes) in unrequited love for the emperor. The Emporer does not care about people but for some reason cares about he bottom and is completely obsessed with him and will do anything to protect and have him. For some reason the author just had to write them as cousins ( why?!) and the top has known the bottom since he was a child ( grooming anyone?).
Treasured and protected daughter of the duke is coveted by his trainee. The two men protect and adore her. The trainee is a secret prince and tries to regain his kingdom in order to protect and love her. The dad is extremely protective.
ML is abused by his family, the FL is adopted into his family and adored by the abusive family. ML becomes obsessed by her and she is the only person who is kind to him and tries to love him. He quickly tries to take over the family in order to be the one who can protect her and be by her side. whilst shielding her from his darker nature.
Zombie apocalypse world. The top and bottom fall in love and try to survive. The top protects the bottom despite being infected.
Midnight Dweller