Well, such are the beginnnings on the path of retraction
: a lot of new sensations and feelings that are difficult to manage and go on on different levels.
Firstly, it is mechanical: when your glans gets out from under the warm, soft and safe cover of the foreskin, it starts to feel new world and new materials to rub against and which produce a whole new stimulation. It is almost like taking a puppy for a walk for the first time: everything is new, everything is different, and has to be explored. And a lot to get used to.
Secondly, its psychological. Glans is THE essential effective part of our biological sense of maleness, the most sensitive and sensual part of our reproductive tool. The intimate act of uncovering it and exposing it towards the outside world opens a new level of self-awareness and sensation, and uncovers a new dimension of our sexuality. It is a constant teaser, being exposed in your sexual vulnerability and sensuality.
It all cools down eventually and after a few weeks, months perhaps, everything goes back to normal. Normal, but in a different way, and after this cool-down you start missing the starting thrill and excitement. However, to be sure, many other benefits and rewards of pulling back start to build alon as we go.