You know that thing in baseball where two people take turns putting one hand above the other on the bat to decide who goes first, or whatever?
Thats kind of what Mary-cat and Blossom-cat do with their positions on my body. Blossom might start on my lap. Mary will settle above. Then later if i move or unsettle them, Blossom will take the opportunity to settle on my chest, and so on and so forth.
The one who gets close enough to my face to smother me wins.