for your sins
for (one's) sins
As a punishment or disciplinary action for one's wrongdoing. Primarily heard in UK. Let me guess—I have to clean the toilets for my sins.
for your sinsused to suggest that a task or duty is so onerous or unpleasant that it must be a punishment. chiefly British
1994 John Birmingham He Died With Felafel In His Hand Then the extended family that is Brisbane sent some people along to keep me company, and for my sins, I took them in.