Don's Lair

Don's lair can only be accessed during certain quests.

Don't mess with Don
See also: Don's errand

After their conflict with one of his men, Don would order to arrest Lust Doll the next time they show up, and bring them to his lair. While here, you can roam freely, but since you can't leave, and gangsters would only insult you when approached, there's no real reason to not just go straight to Don; he can be found on the second floor.

After, instead of paying, Lust Doll agreed to do some grunt work for him, Don sent them to bring back Cassie. However, not trusting them enough, he just sent some of his own men to spy on them, and when Lust Doll indeed tried to warn Cassie, they just abducted the poor cat-girl. Regardless of wether Lust Doll accepts their "reward" or not (Don's still willing to pay, because he did receive what he wants), the entrance to lair would be once again sealed off.

The big rescue
See also: Cassie's rescue

After preparing for the rescue operation, Lust Doll would visit the Don's lair again. This time, you can't freely roam; instead, you would automatically progress through it as you pass the skill checks.

If you fail any skill check while here, you become trapped here as yet another of Don's pets, resulting in Bad End, otherwise, you successfully take Cassie out of the building. If Arlene was not recruited, both police and the Don's gang would be after you, also resulting in Bad End, otherwise, you would leave with Cassie. The building will be sealed again afterwards, this time seemingly permanently.