Bubble chart based on user input at runtime

Please refer to the image attached which is a mockup. 

The Red bubble is what the user should be able to enter values for on the report screen by way of X and Y coordinates. Also the size of the bubble is proportional to the X value. 

Please note all other bubbles are based on values from a dataset queried from a database. The red bubble is what the user should be able to create as on overlay on the blue bubbles. The user should be able to change the X and Y values to reposition the red buble on the report at run time.

In the image X is a % discount and Y is a deal size. The other filters on the report are From Date, To Date,  Product code. So based on the deals for the period selected the blue bubbles show up. The red bubble then needs to overlay the blue bubbles seen in the image. ThanksDynamic bubble based on user input