Wearing my GF thong

So it’s the second day in a row that I’ve been wearing my girlfriend’s thong(with her consent). It’s started because I got stuck at her house without underpants and I wanted to take a shower so I had to wear her underwear’s or nothing and I saw the opportunity to do some kinky thing. I searched for the thinnest thong and told her I’m going to put it - she agreed and laughed. Later that night I gave her foot massage and I literally cummed twice of the thought that I’m wearing her thong. It was so good. The next day I had to take a shower again and again took thin thong like it was a normal thing and again she laughed and again I gave her foot massage and cummed again. I’m really into this and I want to talk with her about doing it more often, even everyday and maybe even put chastity belt and her thong or suggest that I start buying my own thongs.

How should I tell her that ? I may add up that she knows about a lot of my fetishes (and I’m an extreme one lol) and she’s really cool and active with most of them