current sensitivity system only works with random NPCs so when you initiated sexy times (or got forced) with some random NPC, your and their sensitivity of the involved parts get in-/decreased.
But this also means any other scenes don't use said sensitivity, such as masturbation or scenes with special NPCs.
I save edited my dick sensitivity to 10000% which (obviously) made my character cum instantly when a random NPC touched me but while masturbating or engaging in specific sex scenes it takes the same time as always.
after you felt watched, you should get an event where you get kidnapped, go from there. It happened near my cell for me.
If not, maybe your slave isn't trained well enough/doesn't have a high enough pet level
to get the new slave auction content you do the quest line for the NPC Socket up to where you can buy Cell expansions to be able to hold slaves, enslave some random NPC, train your slave until they fully submit to you, then the new content will trigger
also, for anyone wondering how to remove the permanent chastity cage you get from the Dr. Quinn quest and finding no answers here or Discord yapping about how "
iT's SuPpOsEd To Be PeRmAnEnT" while not giving a straight answer, here are a few ways to remove it and also how to get it back on again