You have a very rare condition that has no known cure. This condition makes your body produce a copious amount of semen. The semen builds up so quickly, and your crotch will begin to ache if it builds up too much. You need to release the excessive amount of cum to prevent this.

Your rich parents, knowing about your condition, have given you a gift. Your parents bought Suika to be your cum dump, and whenever you feel your semen is building up too much again, you can use Suika to release it all.