How can I make a move on my straight friend? I'm 15 and bisexual?

Alright I’m 16 and my friends 15 were super close and when we were little we used to hump each other lmao!! And so we grew up and I was the first person she ever mad out with an same with me. We used to do it a lot too lol and I’ve fingered her and her me. I’m pretty sure I’m bi cus I’ve also made out with another girl. But she says she’s straight. But yesterday she kept telling m to * her and she was stradling me and kissing me on the cheek but yet she says she’s straight. So she’s going to be spending the night at my house soon and everytime something fun happens. Except last time. So how can I make a move on her? What can I say or do? She thinksporns nasty so that’s out lol. Andwe both really like it when we kiss :) she’s admitted a while ago that she only does stuff like this with me. And I only wanna do this stuff with her too. Yesterday she wanted to dress me up like a slutty office worker lol! And she wanted to dress up as a slut too! I didn’t do it and neither did she, because I wouldn’t do it. I should have lol

So what do you gets think about watching American pie with her in my bed when my parents arnt home? And I could get some strawberries cus she loves those.

Any other ideas?