As Thanissaro wrote, "There’s a lot to explore in this area, and it’s something that each person has to learn for him or herself, as we each have idiosyncratic ways of relating to the breath currents and the pains in the body."
Sounds like you are spreading pleasant feelings like Thanssiaro says, but on a micro scale, see step 4 in Each and Every Breath. Note steps 5-6 are about a broad fully body awareness.
The only thing that comes to mind that might be related to something harmful is seeing something painful/stressful as pleasant. That would be masochism right, but it does not seem you are doing that.
"Monks, there are these four perversions of perception, perversions of mind, previsions of view. Which four? 'Constant' with regard to the inconstant is a perversion of perception, a perversion of mind, a perversion of view. 'Pleasant' with regard to the stressful...'Self' with regard to not-self....'Attractive' with regard to the unattractive is a perversion of perception, a perversion of mind, a perversion of view." An 4.49