Is it wrong to accept money from your preacher?

My preacher wanted me to teach the youth at our small church. My husband told me I didn’t have the time to do it and even getting money for gas to drive to the church for different programs would be a problem. This is all true but I felt led to do it and I am good at it. My preacher sneaks me $100 a week out of his pocket and the extra money has really helped out. Do you think that is wrong to take it? My husband thinks it is wrong because the church thinks they are getting all my work for free but I couldn’t do it if I wasn’t given the money and I do enjoy doing it and the teens love me. They do not put Sunday school teachers on the pay roll it is volunteer. Do you think taking the money is wrong?