Two options to start this. Option 1 is to start in a Shin-to-foot with a Clasped hand grip , then step into the foot-to-foot by aligning the flyer and base's toe ball and heel, releasing the hands so the flyer can stand up.
Option 2 starts with a Tempo into a foot-to-foot with a Clasped hand grip and the flyer in a squat position on the base's feet.
To exit, the flyer will slowly bend their knees until they connect hands with the base, and step down.
Form tips
Base and flyer will engage the Core , and flyer will engage the inner thighs to maintain a straight and strong line with the legs, while the base stacks their legs ( Joint stacking ).
When the flyer is moving, be sure to move slowly and methodically so the base can maintain a balance point.