*HOTLINE BLING* 📱aka, phone sex

So....I was chatting with my male friend recently. We live on opposite coasts now, but we met about 5 years ago and have kept in touch ever since. Both of us are single, late 20s. Anyway, he's always been flirtatious with me, but last night he was more forward than usual and we ended up having phone sex. It was surprisingly hot. Now I'm like, what did we do? What does this mean? And I'm not sure how to talk to him about it. I do know that it's not something either one of us have done before.