Pretty much anything by dira, but you might prefer the lower rated ones as some are mostly fun-with-porn. But I especially like "The Boy and the Beast" - https://archiveofourown.org/works/751583 and if you also like Generation Kill, then "The Strength of the Wolf is in the Pack" is great - https://archiveofourown.org/works/780304.
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Edited for a better icon.