My GF (26) and I(M) (22) love each other very much.
It just so happens that we don’t have that much sex because there’s so much stuff to do and also because we live together w/ my mom so we have to be very quiet.
She sometimes asks me what my phantasies are and I being who I am wiggle myself out of that question knowing exactly that I should tell her what I am into.
This one time though I told her that one of my interests is chastity, she showed a much calmer reaction than I would’ve expected and was even interested in the details like how long and in which situation.
She then said that she’d be open to it but not for a long term thing, she wanted me to have it on in sexy sitiuations when she would tease me.
I was very happy about her being open to it and we made love that day talking about me being locked up.
A few days later (we haven’t gone through with the chastity yet) she surprised me by standing naked in the doorframe, bent over revealing a shiny little “crystal” in her butt.