Season pork tenderloins with salt and black pepper.
Heat oil in a skillet over medium-high heat. Cook tenderloins in hot oil until browned on each side, 3 to 5 minutes per side.
Remove from heat and cool.
Preheat oven to 380 degrees F (193 degrees C).
Stir juice from 1/2 lemon, sage, and lemon zest together in a bowl until a paste forms; spread paste over each tenderloin.
Wrap bacon strips around each tenderloin and place in a baking dish. Scatter apples around tenderloins and drizzle juice of 2 lemons over meat and apples.
Cook pork in the preheated oven until apples are tender and pork is slightly pink in the center, about 25 minutes. An instant-read thermometer inserted into the center should read at least 145 degrees F (63 degrees C).