what I'm looking for is manly guy being raped.
the person being raped must be masculine, preferably with a six-pack. but not necessary hairy or fat. (I'm not particularly looking for a bara)

just someone who LOOKS like a seme, being raped

This fits your request: Kyokan Hunter . Well, it's not the violent type of rape, because I resonally never enjoyed that thing so I don't read it, but it's more than dub-con (almost non-con) at the beginning. Enjoy!

Lemme see...
Shigekiteki na Kankei and Motto Shigekiteki na Kankei
Jive, though I still cant tell if it was noncon or not 0_o Fuhoni, though the uke never actually gets raped, but comes close Ch 1 & 6 of bousou kareshi coming really close to rape, but being saved by semes :3 Eien no Tameiki, the uke likes it, but the seme kinda, uh, knocks him out :# In jazz the seme ALSO knocks him out( seems to be a seme thing) and it starts out with noncon In Sono Kuchibiru ni Yoru no Tsuyu is extreme noncon, but the ending is cute :3 Anyways, thats all I remember, hope I helped.

Devil’s Thoroughbred, maybe? The seme tapes the whole thing, uses it as blackmail. It's really short though. I'll update if I remember more.

It's the Art of Time, it's the Art of Life--
Of the player and the craftsman,
Of the writer of songs, of the creator of love,
Of those who will follow, of those who led,
There's no other way in the world ahead ♥

ohhh I love this kinda topic

Hua Hua You Long
Kuroneko Kareshi no Asobikata
Ubawareru Koto Marugoto Zenbu
[m]Devil's Thoroughbred[/m]

I know I read more, but I just can't remember them Dx