Obviously watching another guy get it on and unload with your gal is a much different view and prospective.
We have a friend we include pretty regularly.
There's times they get it on pretty hard and he cums with her.
Other times, usually her second round she's on her back, her head is on the pillow, her arms are over her head, she's just laying there moaning while he's pumping. He starts to cum, pushes in and just stays buried in her while he let's it go. She seems to love that.