In the early stage, when the girl is nervous, touch her butt or lower chest.
Later, when you can do multiple interactions, select an interaction with the left mouse button, then press the middle mouse wheel to lock it. Then do other actions.
You can use both hands, tongue, and penis at the same time.
After using one hand, press the right button of the mouse to use both hands.
My operation sequence:
press and hold the left button (one hand) --> press the right button (two hands) --> press the middle scroll wheel (lock action) --> other actions
