Is it bad that I'm thinking of refusing to pay for my sister's bedbug treatment even though I played a stupid prank on her that may have indirectly led to her getting them?
Are you sure that your sister got the bedbugs from the prank you played on her?
No, but it may be a cosmic justice after she revealed the fact that I'm indebted to this one company for 20k.
If you are responsible for the bedbugs you should help cover the cost to get rid of them. Bedbug treatment can get expensive, and it's unfair to expect her to pay for it if it's something you caused. She will be resentful that you cost her so much money.
I did contribute to their onset. It was my fault. I guess I can pay for her costs.
Well I hope you do. If you cause the problem you should pay for it.