I'm looking for mostly yaoi (but shounen ai is ok too) where the uke is kidnapped and captivated, and he's been chained/bond. There is an iron handcuff in his hands or ankle, so he can't move.

Like in Innocent Bird by KISARAGI Hirotaka http://www.mangaupdates.com/series.html?id=520

First, when you want to add details to your request, you can edit instead of making another message. =)

Okay! =) Here I come

Hoshi no Yakata cuffs and cages
Sadistic boy cuffs
Sokonashi Freefall Romance
You're my Loveprize in Viewfinder must have it somewhere
Koisuru Boukun have a side story with handcuffs if I remember well.
Ai no Kusabi (mostly in the remake) - - - (but I think there are too in the original)
Aigan shounen
General Dandy
Koi no Tsubo I think it have it in the story with the merchant...
Dokunonagi (not the uke)
Bi no Isu
Sex Therapist (not sure)
Katayoku no Sokubaku don't remember n.n
Ginkaku Hakushi to Marmot hem... robots... so it does the same? ^^

I didn't recommend when they're tied by ties, rope, things like that because I understood you wanted metal. Yet the places where it's written (not sure) is because I'm not sure if it's ropes or metal...

Variety's the very spice of life, That gives it all its flavor. -- William Cowper

Zion no Koeda

^ facepalm How did I forget this!!! ^^

Variety's the very spice of life, That gives it all its flavor. -- William Cowper

Ryoshuu Reijin

Thanks guys! I've already read all of them 😀

Sasayaku no wa Sono Yubi

What about Egomix? The uke is not exactly chained but is strongly restricted in every move of his by the seme 🤨

In Jadou - Tenmou Yatan, the uke is captivated. And you must also try chapter 4 of Ouji no Hakobune :33

Quote from sissiee

Thanks guys! I've already read all of them 😀

All of mine...? ='(
God! xD You're an hard reader!!! =D
I can't believe it! <.< >.> I'll search for more

EDIT: hmm... Tatoe Toraware no Koi Demo ?

Variety's the very spice of life, That gives it all its flavor. -- William Cowper

Yeah, I know 😀 I love these kind of stories and I've read what you recommened guys, so thanks, they were so good!
My favorite is Tatoe Toraware no Koi Demo. It's a perfect example what I'm looking for, and now I'm reeding CJ Michalski mangas, love it!

Yeah, CJ is nice :3 And he did some with chains or bdg...

I remember I also loved Mori no Animal Company =) It was very cute.

Variety's the very spice of life, That gives it all its flavor. -- William Cowper

I know exactly what you're looking for, it's Warehouse. That one is very interesting 😎