So you make the idea symmetrical.
When you delegate SP, the VP of the receiver is affected by the delegators VP.
Case in point:
Bob has 110 SP and is at 100% VP. Larry has 1010SP and has 0% VP.
| Name | SP | VP |
|---|---|---|
| Bob | 110 | 100% |
| Larry | 1010 | 0% |
Larry Delegates 500SP to Bob.
| Name | SP | VP |
|---|---|---|
| Bob | 610 | 18% |
| Larry | 610 | 0% |
Larry removes his delegation
| Name | SP | VP |
|---|---|---|
| Bob | 110 | 18% |
| Larry | 1010 | 8.9% |
The only way this system can work is if instead of Accounts having VP, is that every SP has a VP. This can be on a 1SP level to start but will need to reduce as the price of steem (in theory) increases.
Otherwise people with a lot of SP will be able to steal VP from those less fortunate. Such as Larry above