It's his protective side kicking in. He wants to make sure you are good and taken care of before he decides to rest. He'll go through a mental list, make sure he remembered to lock all the doors, feed the cat, and turn off the tv downstairs before giving you a gentle kiss right below the ear.
Allowing himself to be the big spoon because he wanted to protect you in his sleep. "Goodnight love."
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Harry Styles Imagines and Preferences
FanfictionImagines and Preferences about the one and only Harold Styles as you may have worked out from the title oopsssssssssss Feel free to check out my other 5 books of one direction imagines and preferences ;p