What is the ruling on making up 15 days of Ramadan fasts missed during adolescence, and two days in which a husband had intercourse with his wife during Ramadan, knowing that the husband takes medication that may prevent him from fasting?

You must make up for the days you missed fasting, and consecutive making up is not required. As for intercourse, two expiations are required for the two days that were nullified by intercourse, and this is the view of the majority of scholars. The expiation for one day is: freeing a slave; if that is not possible, then fasting for two consecutive months; if you are unable to do that, then feeding sixty needy people. It is not permissible to move to feeding if you are able to fast. The continuity in expiation fasting is not broken by breaking the fast due to illness.