Gambling Debt

I 48 divorced play poker and have been in a regular game for 2 years. The same 5 people getting together once a fortnight and playing for money table stakes, to keep it friendly we have a rule. If your low on cash and you want to bet on what will be your last hand if you lose, whatever you've left is taken as a matching bet. Even if the bet is $20 and you only have $5. I've changed all names; old Fred 66 was always short of cash and would borrow $50 off me before each game so he could play in the game. No worries he always paid me back win or lose. But he run of bad luck and was in debt to me for $250, I wasn't worried, and it wasn't secret between Fred and his wife Barbara 58. But this time was different as old Fred had a heart attack and passed away suddenly. I wasn't worried about the debt and let it slide as they say. Barbara still wanted to pay me, and I told not to worry about it. As she wasn't able to pay me quickly, she offered me servicing as a replacement for the money. I wasn't sure what she meant, but she told straight I could fuck 5 times to make up payment for the debt. Barbara isn't bad looking for her age and a fuck is a fuck. So, I agreed, and she really drained my balls and asked me would we mind her taking Fred's old place in the game. I was agreeable and we asked me for the same deal as Fred had, I lend $50 for her to play and if she loses, I get serviced and the others in the game had no problems with her joining the game. She won the first couple of times and then one and I got to fuck her again. I always hope she loses and over time she just got me to fuck regardless of if won or lost. We aren't in a relationship it more mutual satisfaction for us both.