Two stories:
1st story involves an appatent sex slave, who was captured after an escape attempt (one of many). The sex slave is bound and being subjected to sexual torture, then raped.
2nd story features two lovers, while the seme is 48yo, the uke is much younger, possibly in his early twenties. The uke approaches the seme for sex, and they engage in bondage and consensual sex.
To save his chronically ill brother, Yuki goes to an old friend as a last resort. This old friend convinces Yuki to be auctioned off to men as a sex pet, but has an ulterior motive.
Kinbaku