Tengoku de Akuma ga Boku wo Miwaku Suru - Vol. 2 Ch. 13 - Torture

[NeoRetro]

Dayum, shipping mystery is still unresolved, but I get the optimistic feeling that it's not that bad now heh.

Theu didn't straight up answered the mistery but seem to be heavily implying human males simply go from sex slaves to just plain slaves, I think it was a pretty smart way of keeping the mistery