Duty-Bound

"He still couldn't believe his luck. How could the fierce, passionate, unbelievably sexy and capable Commander Shepard be interested in him? His troubled past, his frequent headaches and sometimes unstable biotics ... none of it seemed to matter to her. Regs be damned, he was dangerously invested in this." Post-ME1-ME3 drama, angst, and eventual fluff and smut! M rating for future chapters.