Bucky stops moving, when he realizes that Sam isn't calming down. Leans forward to press Sam's back to his chest and settles into the chair. Very little movement. Just... Being there. Holding him. Giving Sam a chance to catch his breath and relax. It does mean that Bucky's cum comingling with Sam's slick drips around the base of his cock, leaking from Sam's body, but.

Not like Bucky minds that at all.

He sniffs Sam's skin while this happens and finds something strange. Bruises that he didn't see earlier, on Sam's shoulders and his hips. Handprint bruises, from an alpha who held Sam in place and didn't allow him movement.

A slight growl at this realization, deep in his chest, before Bucky licks along the bruise at Sam's shoulder.