Actually, using an eye cream for lips is an old Hollywood trick. And, it works! Because the skin on your lips π is quite similar to the one under your eyes π
Many makeup artists using this.
I use blush on my eyelids and on my lips (mixed with some clear gloss). Also I use it for contouring. It gives more uniform look and rested appearance. Make sure the blush is not offensively pink or Coral. Mine is pinky beige