people tend to assume martin's submissive in bed, since he's just so nervous and eager to please. in actuality, he's a huge dom. there are various reasons for it- mostly the sense of control, of being trusted completely. unfortunately, he doesn't exactly get many opportunities to indulge in it, and when he does, it tends not to be as... intense as he really wants.

then someone finds out- if the "any" is Jon, maybe he accidentally compels martin or something. whoever it is, they decide they want to make his secret bdsm fantasy a reality.

added bonuses
+any bondage- ropes, handcuffs, ect
++extended degradation/submission
+++his partner has a sub awakening during
++++martin's fantasy requires an awkward pre-sex shopping trip for props/materials/costumes/ect

no dnws!