i propose nice addition to the VN (also to any other master-maid game)
the rules of "Russian sex-roulette for the maid and master" are not very complicated
the maid is forbidden to take contraceptives. totally.
if the maid wants to make a move in game she blows the master (master can not accept the blowjob - move can be taken at other day of the week), the master during the blowjob tells her the number that corresponds to the date before the end of the week, which corresponds, presumably, to the date of the maid's ovulation. if the master has guessed right, the blowjob stops and on the guessed date the maid will have sex, and will be guaranteed to be "shot" - that is, she was out of luck. she cannot refuse the “shot” quite “painlessly” (unless the master himself chikened to “shoot” the maid - he pays for his chiken-out bonus montly salary - because master MUST "shoot"), she voluntarily refuses a monthly salary as a punishment for the “chicken-out” ...
if the master is wrong - he gets his blowjob with a happy ending in the maid's mouth, and on the specified date the maid will also have sex, however, since it will take place during a safe period - this will be just a nice addition to the maid's salary.
and the next such game is possible next week.