Bucky could only imagine Steve's face when he showed him. Imagine the response his husband's body would make. The rolling tightening of his lover's groin, until he just had to reach out and stroke it.
The need to do this to her, was the only thing that kept him seated, where he was. The want to watch her fingers hold her lips apart, until they couldn't anymore. The perverse pleasure he got from being this close to her, but still so fucking far away.
Bucky moaned softly as she did. Letting her inner muscles coax the slick plastic out of her, only to push it in again. He was panting at this point. Like sitting here, fucking her with the device was akin to running a marathon.