Once upon a time, there was a man named John who was married to a woman named Lisa. John and Lisa had been married for ten years, but their marriage was unlike any other. You see, Lisa was a queen of spades and John was her cuckold. Lisa was obsessed with black men and loved nothing more than having sex with them in front of her husband. John, on the other hand, was kept in permanent chastity and was only allowed to have sex with his wife through anal penetration, either with a double dildo or with the bull's cock. For ten years, John had lived this way and had accepted it as his life. Despite his humiliation, he loved his wife and would do anything to please her. But one day, Lisa dropped a bombshell. She wanted to have a baby, but she wanted it to be from her black bull. John begged her not to do it, but Lisa was determined. She came up with an idea for a roulette, and their lives would never be the same again. The rules were simple. Every day, the bull would cum balls-deep in Lisa's pussy, and John would be allowed to clean it up with his tongue. The cuck would be fucked anally until he cums in a cup once a week, and he would be allowed to use his tongue to insert his own cum into her pussy. This was the only way he would be allowed to put his pathetic cum into her pussy, desperately trying to make her pregnant with his baby. The one who got her pregnant was the winner. Lisa had made it clear that the outcome of the roulette would permanently shape the rest of their lives. If John somehow managed to get her pregnant and win at least once, she would stop allowing the bull to cum in her pussy and wouldn't have any children anymore. She would also release John out of his cage once a week, give him a titjob or a blowjob, and swallow his cum as a sign of admitting that he was worthy of it. She would also let him have sex with her pussy four times a year: on his birthday, on her birthday, on their anniversary, and on the 14th of February. However, if the bull won, the roulette would start over. If the bull won three times in a row, John would no longer be allowed to put his cum in her pussy, and she would never stop getting her married pussy inseminated by the bull every day and giving birth to his children, while John was permanently locked for the rest of his life. Also, he must raise all the bull's kids together with her while the bull took no part in their children's lives. John was left with no choice but to agree to the roulette. He knew that the chances of him winning were slim, but he loved his wife and was willing to do anything for her. For months, the roulette went on, and John cleaned up the bull's cum every single day. He was allowed to insert his own cum into her pussy once a week, but there was no sign of pregnancy. Months turned into years, and Lisa had given birth to three children from the bull during that time. John had raised them as his own, but it was clear that they were not his. Every day was a reminder of his humiliation, but he continued to be a devoted husband to Lisa. It was on their tenth anniversary when something unexpected happened. Lisa discovered that she was pregnant, and the baby was John's. He had finally won the roulette and had managed to impregnate his wife. For the first time in years, John felt a glimmer of hope. He knew that Lisa would now honor her promises and release him from his cage once a week and let him have sex with her pussy four times a year. And so, John and Lisa's story had a happy ending. They now had a child together, and Lisa had fulfilled her promises. John was no longer a cuckold and was no longer kept in permanent chastity. He was finally able to have sex with his wife as a real man, and his wife was pregnant with his baby. Despite the years of humiliation, John had won the battle, and he was finally free. Every day, the bull would cum balls-deep in Lisa's pussy, and John would be allowed to clean it up with his tongue. The cuck would be fucked anally until he cums in a cup once a week, and he would be allowed to use his tongue to insert his own cum into her pussy. This was the only way he would be allowed to put his pathetic cum into her pussy, desperately trying to make her pregnant with his baby. The one who got her pregnant was the winner. Lisa was very young and fertile.Let's say the bull's sperm is high quality and John's sperm is low quality. Let's say Lisa has a 28-day cycle and John gets to insert his semen on days 1, 8, 15, 22. Let's say her ovulation period is from day 11 to day 12. Give an approximate chance in percentage of John and bull winning, even if it is not completely correct.

What information do you need to give me an approximate chance?

Lisa's 20, she has no fertility issius, John and the bull don't have health issues.

By the rules, this will continue until Lisa gets pregnant, so let's say her chance of pregnancy is 100%. So their chances must approximately sum up to 100%. So what are their chances

Try to give a bit more certain percentages, even if not completely correct

Let's say Lisa's exact ovulation period is on days 11-12 and it is always this way.

The percentages don't sum up to 100

Bull was allowed to deposit his semen balls-deep in Lisa's pussy. John was only allowed to insert it with his tongue, as far as it could reach. Did it affect their chances? If it did, give the new percentages considering this factor