Angel and the Assassin

Angel and the Assassin - Fyn Alexander An m/m romance between two dissimilar characters, full of erotica and hardcore bdsm. The use of 'Daddy' and 'boy' is a bit grating but I enjoyed the story and the characterization. Will probably read the more highly rated book two at some point. Yet another horrid book cover. Kael is definitely Jason Statham:
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And Angel is 'Cloud Strife' from 'The Advent Children':
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'If Kael Saunders was anything at all, he was stunningly intelligent and utterly ruthless. It would not surprise him in the slightest if Saunders fancied the boy for a change from his usual type and had taken him along for fun, planning to kill him in a few days or weeks.

Or did he have another plan?'