@Thecannon
It's easy. Raise her affection with the masked trainer, choose personal slave(affection +2). Once you have the tentacle monster, click it but don't make her sleep with it when she says no(affection +1). If your character says she's not looking well check your wine cabinet and save her heroically(affection +3). Use vibrator to increase her lust now. Talk to her and whip her when she's lustful(both affection +1) Click monster again and she said she wants to fuck it but only with monster potion. Take monster potion from cabinet next to wine and let her do it with the tentacle(affection +4). Erotic whipping(affection +1) Demand handjob and ask to be called master(both affection +1). After affection above 10 she's not trying to escape anymore.
You can get another (affection +1) at the beggining if you treat her kindly but it's risky for me because she could escape.
Training is done at +14 affection.