I love how Peridot thinks allot about Lapis’ triggers. First in Beta she’s like “I try not to say the J (Jasper) word.” And now in Back To The Moon Peridot is worried that Amythst in Jasper form saying “You guys want to be prisoners? ” could be a trigger, so she holds Lapis’ arm to comfort her.
We already know Lapis hides her emotions internally very well. I can imagine that when home alone with Peridot, Lapis is more open about her feelings.