An old friend

Soooo there’s a girl I’ve been friends with since 1st grade. We’re both 25 now and super straight but we’re both very sexual people. She’s a massage therapist and she’s always been a naturally touchy affectionate person. One night last summer we came home drunk and slept in my bed and she was a lot touchier than normal. Nothing really happened because my other friend came in and I brushed it off and we ended up passing out but I can’t stop thinking that she wanted more. We always have talked about wanting to have a threesome w another guy so I know she’s not against girls. I would be 100% down to hook up with just her but I’m not sure how to go about it as I don’t want to ruin our friendship or make things weird.