Yeah, Penny and Alex should have a to spend some time together.
Remember the tattoo conversation:
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I think the best scenario for a Penny and Alex is something like:
Penny already decided she wanted to have a tattoo and she want Orion to go with her.
Then Orion or Penny will call Alex (knowing she have a lot of those) and asks her where is the best tattoo shop.
And Alex decided to go with them (because she knows the tattoo artist and maybe they could get a discount because the tattoo artist created all Alex's tattoos) then Orion will be asked by them to have a tattoo.
Maybe something like this kind of scenario...
Oh yeah and of course a threesome after they get tattoos.