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Thinking about how around his classmates Denki Kaminari is just a goofy guy but when he is with Reader behind closed doors it's a diffrent story.
Denki is a natural sub, he likes pleasing his Master (Reader) and knowing that he will be protected and taken care off.
Denki is known to be a ball off energy, but when Reader wants to do their homework he will sit patiently by their leg, smiling softly and closing his eyes when Reader rests their hand on the top off his head, gently playing with his hair while still doing their homework.
Denki loves cuddle time, it's usually in the evening, when Reader has their homework done and has been helping Denki do his homework and study a bit. Denki doesn't mind being Big spoon or Little spoon, he feels comfortable both holding and being held.