A breast smother probably would NEVER be seen in a real fight cause more than likely the one doing it would be bit, as for rule arranged matches yes it takes place, rule arranged matches in almost all cases have not just rules agreed on but what if any comes to the loser, such as face sit, matchbook pin, smother and more, as for how it feels well that is an obvious answer, you beat your opponent so now you sit up on her and take your reward for the win so it isn’t so much a breast smother as it is a high to drain your opponent down more, as someone who breast fights and rule cat I willl say I fully enjoy smiling as I trash talk my vanquished opponent under me in any form.