A cap assembly for removable attachment to a non-mechanized masturbation device is provided. The cap assembly comprises at least one moveable extension member, and at least one actuator adapted to move the extension member. The actuator may include a motor. The actuator is adapted to move the extension member in one or more selected directions, such that the extension member can contact an elastomeric gel provided as part of the non-mechanized masturbation device, and move a portion of the elastomeric gel to impart sensation to a user.
