You return to your appartement and Lydia has a proposal

After you made your way back with the bus (Marla decided to meet up with a couple of friends), you open the door to your appartement.
Just as you are about to enter, Lydia opens the door across the hallway to her appartment.
"Ethan! Come join me real quick."
You follow her to her room, and make yourself comfortable on her bed.
Lydia closes the door behind you. "I´ll make it quick, I have a fun idea and I need your help to set it in motion."
You decide to hear her out, feeling almost...nervous?
"So, I spoke with Hailey, and I know that she told you about her cage, and that I hold her keys. Now, I dont know if you know this, but as her keyholder, usually I get to decide who she tells about her cage, and who shes having sex with. So I decided to punish her a bit."
You really hope you´ll get away easy in this whole story. "What did you have in mind?", you ask?

Lydia smiles. "Its where you come into play. Believe it or not, Hailey is really into cuckqueanin, or at least voyeurism combined with denial. And I thought, since the walls are preeetty thin..you could help me make tonigh a bit more interesting for her."
Your mind jumps to John, and what his girlfriend could mean by this. "What exactly..."

Lydia continues. "See, I thought we could kill two birds with one stone. You´re not gonna really fuck me. At least not tonight, I want John there for the first time...but neither he or Hailey have to know for sure that you´re not actually fucking me."

She goes to her drawer and pulls out a strap on. "So here´s the deal: You fuck me with this, audible for Hailey and in the best case for John over the phone or something, and as a reward, I´ll let you cum through over means...my tits, my hands, my mout, we´ll see. What do you say?"