The ornamental design for a texturedportion for a writing device, as shown and described.
FIG. 1 is a perspective view of textured portion for a writing device showing my new design.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a right end view thereof.
FIG. 5 is a left end view thereof; and,
FIG. 6 is a top view thereof.
The writing instrument shown in broken lines illustrates environmental matter and forms no part of the claimed design. The stippling shown in the drawings represents texture and forms a part of the claimed design.