Is it normal for legs to shake while making out?

So I was with this dude I'm really close to (I like him) and I had a horrible day because my dad had yelled at me (a different story). We went to a cafe and decided to go a lakeside. There things got cosy and we made out. It wasn't my first time that I made out with a guy but it felt so good that my legs got shaky. Is this normal?

Is it normal for legs to shake while making out?
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