Rape
Uke is sold by his parents to pay their debt.
SPOILER
Happy ending
kid is sold as slave and becomes the seme's slut.
massive rapes till the very end
sex slave
kidnap
ridiculously girly uke (seriously doesn't look like a guy at all)
most helpless & stupid character ever. literally doesn't do anything, not even move or barely complain when he's about to get raped)
yakuza themed
SPOILER
Uke is bought by the seme and sex is the only thing he's "saved" for. In the end he likes it, but is incapable to admit it.
sex slave
S&M and bondage
threesome
As the name indicates, a human pet.
Uke is used as plaything
master and servant
sexual abuse
Chapters 1,2 & 3 are about a uke used as plaything by seme.
Slave uke/ servant uke