Can you all explain whether a double handshake like that is common and also why it made me feel so special?

So in my previous post, I mentioned that I met this amazing German woman in the Blossom Bookhouse of Church Street of our city Bangalore in India yesterday evening. It was one my best interaction for sure and she was so damn friendly and pretty at the same time and it was perfect way to end the outing. She is mostly traveling now after she completed her Bachelor's in Arts 2 years ago and I am freshly done with MBA so she is definitely about 23-27 age range and I am 25. But her handshake felt unique. That's because she used both her hands to have the handshake with me. Like I used only my right hand but she hold my right hand with both her hands for the handshake and idk why I felt this vibration and amazing feeling after it.

Yeah that's mostly just her style of handshake and just her showing basic friendliness but I found it special and even subtly intimate than regular handshakes. Yeah maybe it felt so special because I was shy and had no female interactions for years due to bullying in school which led to low self esteem and social anxiety plus the Indian upbringing which is definitely more conservative than the West and also mostly growing up with other Indians so talking to foreigners is rare for many Indians in India. So yeah I am only actively interacting with women since the age of 23. But yeah that double handshake felt special even though I am literally a 25 year old grown man now. Her bubbly nature made her seem more attractive too.