Harmony is used.

She doesn't know what to do.

The choice is taken out of her hand as one of the women- Donna- grabs her tits.

"Forward," she says simply.

Harmony obeys, having no sight currently and unable to use her arms.

She walks until she is told to stop.
She is in front of a tree.

All 3 women surround her.
Annie (on her left) and Ariel hold her in place in front of a tree, while Donna gets more rope to use.

She connects the new rope to the tree and then Harmony's bindings.
She's forced to lean forward in a strappado position.

They all do something before Ariel removes the wrap around Harmony's face that was blinding her.

She looks forward- as that is all she can do- and sees...a strap on cock sticking out of Ariel's pants.

Before she can say something, another one is used- this time by Annie shoving it into her pussy!

Ariel plays with her tits for fun.

Of course, she's not going to stop there.
Donna will want to join in too.