Never pass up an opportunity

Robbie/Oberon figured that the sisters were good enough for now, but he could still use Titania.

"My Lady Titania, these are delicate magics. The sisters form a sexual triad that help with the flow of magic. If you were to enter on your own, then the triad would be disrupted and the energies would be dangerously released. However, if you had two women partners of your own to form another triad, then the magical flow would be doubled safely."

"I have a couple of women in mind. I'm sure that with my power it wouldn't be that hard to convince them to join me for a while," said Titana with a knowing grin before she teleported away.

Robbie/Oberon then turned back to the sisters who were now under his complete control. With nine holes and three pairs of tits he didn't know where to start the fun until Titania came back with who she chose.