Hi,
First, tweening is not ideal here, unless the mouse position is only valid as you click, but what if the user click and drag, does your feature needs to follow? if yes, then use the action MoveTowards and set the distance to 0 so that it constantly move towards even if it reached the position 100%.
Also, did you check out the Ecosystem sample : MoveTowardsWithConstraint
it's a sample where you click and the object will go to that position under the mouse click position, I added some constraints, but that's just for illustrating, you can remove the constraint feature if you want.
Let me know how it goes,
Bye,
Jean