The serum enhanced all of Steve's senses, but no one ever taught him how to decipher heartbeats, and since he relies on (super) sight he never tries to feel the layout of things, etc. Since there are obvious advantages to knowing when someone is lying (especially post-Tony-and-Bruce-secretly-built-a-murderbot) and having total spatial awareness, he asks Matt to teach him.
(There was no specification regarding shipping or gen, so I just kind of went with what felt right.)
Matt/Steve: Better Than a Parlor Trick
Matt teaches Steve how to use his super senses
The serum enhanced all of Steve's senses, but no one ever taught him how to decipher heartbeats, and since he relies on (super) sight he never tries to feel the layout of things, etc. Since there are obvious advantages to knowing when someone is lying (especially post-Tony-and-Bruce-secretly-built-a-murderbot) and having total spatial awareness, he asks Matt to teach him.
(There was no specification regarding shipping or gen, so I just kind of went with what felt right.)