I am having the hardest time remembering better details. But I remember the main character passing an alleyway and witnessing another guy getting bullied or beat up. He steps in and saves him and the victim was very sweet and grateful; an innocent bishonen. It's only later that the main character finds out that it was all an act and the guy was actually a bit of a sadisit and way more flamboyant and sexy; I think he even started to wear flashy-er clothes... Pretty sure he was the uke too, just more dominant. It may have been a one shot...

Any suggestions or ideas would be awesome!! I've been trying to figure this out on my own for three days Haha.

I think you are looking for [love monster mio junta] chap. 3-4