You join in.

This is too hot to just watch.
You walk towards the bed, the floating Starfire keeping up her 69 with you as you move.

As you approach, Raven is mounting the magic 'dick' that she put on the bound Jinx.
She sighs at the entry.
Jinx does as well, since it lets her feel this like a real cock.

You set Starfire back on her feet and tell her what you want to do.
She nods happily.

Raven gets filled up with the strap-on as a still-shocked Jinx enjoys this brand new sensation.

Raven only notices what's going on when Starfire sits on the bed next to her and Jinx.

"As one of you already knows, Starfire has a real submissive side. It's due to her being so strong and powerful, not to mention being royalty.
Giving up her power- to someone she trusts- is the ultimate taboo.
Hands behind your back, Star."
"Yes, Master."

Raven prepares to start really fucking, but wants to see this play out.

You push Starfire onto the mattress, her hands staying where they were.
You pull her legs up and open her up a bit.

"Remember, Star, one of the Audience can only hear you, so be nice and loud."
"Yes, Master."

You enter Starfire's pussy with ease, both of you warmed up by the floating 69 and the show.

"I love your big blorfsnag," Starfire exclaims, doing what you asked.
"You're going to take every inch of it. Over. And. Over. Again."

You start to pound Starfire's pussy, so she cries out in bliss and talks dirty in her weird, little way.

Raven starts to ride Jinx's strap-on cock now.