How do I play this "bass guitar"?

-Approach- complete.

-Approach- (Work in progress update 2).

.

Animation test 3.

.... ... .

Wasaaaaaaaap!! #Scream

(Pretty sure this took me an 1 hour & 30 minutes to make.)

Warning "Not safe for work!!"

.

Noon (concept art.)

Yeah I made a femboy.