What Is Love! No, Seriously. [Sirius]

After Sirius delivered the news about his relationship with Isa, Gossamer figured there was no better time than the present so as soon as he was finished and her siblings had taken the news she moved aside to wait for her father to speak with her privately. She fidgeted with her paws, the snow white fur sticking up in odd places as she tried to pat it back down. Clearly Sirius had some idea what love was. He said he was in love with Isa and she needed to know how he'd made that determination. How did he know it was romantic love and not the love of a close friend? Gossy had heard poems and stories and she couldn't quite figure out what useful information was really there. What did love feel like? How did she know she was in love besides just really, really, caring about someone and wanting them to be safe? Was there even a difference?