Linden was the youngest member of the companies family, especially for the fact that she's new at her job even when it comes to shapeshifting in the prostitution business, because even the youngest shapeshifters need help with their job. Luckily, adults like you knew how to handle stuff like that.
Since you joined the F.T.L.A.S.C, people like your older sister, and Helen have showed you the ropes of what was going on in the work place when a customer ordered two shapeshifting prostitutes for an orgy which you were able to handle. Of course while it was a fun night, some customers plan on throwing threesomes. Which is why you had to undergo threesome training which meant getting fucked by Helen, while you had to suck your sister's penis which made you explode cum.