Since Young Duke Clementine has no problems with their daughters' ideas, then Duke Ramil will not try to interfere with them too. He will just guide them on how to properly handle a business. He will also let them think out of their boxes about how to make their store unique and attractive. It will also let them help to consider that establishing a business is not an easy thing to do.
Penelope feels like she is attending a serious class every time she visits the Mendia Mansion to see Finnea and listen to Duke Ramil's advice. Because of Duke Ramil's work schedule, he cannot just leave his office to visit her in their mansion. And besides, Penelope doesn't want to trouble Finnea's father too much. Duke Ramil is already giving enough time to teach all the things they need to learn from him. She doesn't want to disturb the duke anymore.