Based on my prior knowledge, the relationship between fasting blood sugar (FastingBS) and the presence of heart disease can be analyzed as follows:

- If the fasting blood sugar (FastingBS) is greater than 120 mg/dl, then it is more likely to indicate a heart disease.
- If the fasting blood sugar (FastingBS) is less than or equal to 120 mg/dl, then it is less likely to indicate a heart disease.

Based on this analysis, the dictionary can be generated as follows:

```json
{
    "no": [90.0, 88.0, 105.0, 99.0, 103.0],
    "yes": [122.0, 130.0, 145.0, 124.0, 135.0]
}
```

Here, the values chosen for each class represent typical fasting blood sugar levels that are associated with "no" (less than or equal to 120 mg/dl) and "yes" (greater than 120 mg/dl) target classes, respectively. Note that these values are for demonstration purposes and may not reflect actual data.