Stepmom in training! Kylie Jenner, 19, dotes on Tyga's son while parading around in sexy mesh swimsuit in Mexico

She's vacationing in Mexico with her boyfriend Tyga, his son King Cairo. And on Wednesday Kylie Jenner took some time to shower attention on her beau's four-year-old tot as the group lazed around the pool at the luxurious Casa Aramara in Punta Mita.dThe 19-year-old showcased her curves in a mesh detail one-piece with lime green piping as she carried King on her hip.