Duo was very much aware that the overwhelming waves of emotions and feelings that constantly swept through his mind were not normal. However, he wouldn't allow himself to think of them as being *wrong*. He had to believe that his feelings for Heero were right. They HAD to be right. The consequences of thinking otherwise....
No matter how abnormal they might be, he couldn't deny his own feelings. They totally controlled him. Duo Maxwell was just a puppet, with emotions as strings, and Heero as his puppeteer.
And instead of loathing that idea, the concept of Heero manipulating every part of him -- controlling him utterly in thought, sensation, emotion, and deed -- left Duo helplessly and agonizingly aroused.
It all starts with five fanatical mad scientists, several rounds of drinks, and five competing theories of control... specifically, mind control. This is Duo's and Heero's story in the 'Mechanics of Control' AU storyarc.
My notes: Madam Hydra wrote lots of kinky fics. LOTS of them. Unfortunately, she never finished most of them, but if you were looking for non-con BDSM, she was *chef's kiss*. This is possibly her most finished work, which is to say, it's got a beginning, middle and end to the specific scenario between Duo and Heero, even if the overall storyline is unfinished. CW for mental and emotional torture and hot but noncon sex due to mind control and conditioning.